refactor: Use standard OTel SDK env vars

- https://opentelemetry.io/docs/concepts/sdk-configuration

Signed-off-by: Austin Drenski <austin@austindrenski.io>

core/go.mod

@@ -7,7 +7,6 @@ require (
 	buf.build/gen/go/open-feature/flagd/grpc/go v1.3.0-20231031123731-ac2ec0f39838.2
 	buf.build/gen/go/open-feature/flagd/protocolbuffers/go v1.31.0-20231031123731-ac2ec0f39838.2
 	connectrpc.com/connect v1.14.0
-	connectrpc.com/otelconnect v0.6.0
 	github.com/diegoholiveira/jsonlogic/v3 v3.4.0
 	github.com/fsnotify/fsnotify v1.7.0
 	github.com/golang/mock v1.6.0
@@ -18,13 +17,16 @@ require (
 	github.com/rs/cors v1.10.1
 	github.com/rs/xid v1.5.0
 	github.com/stretchr/testify v1.8.4
+	github.com/testcontainers/testcontainers-go v0.27.0
 	github.com/twmb/murmur3 v1.1.8
 	github.com/xeipuuv/gojsonschema v1.2.0
 	github.com/zeebo/xxh3 v1.0.2
 	go.opentelemetry.io/otel v1.21.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v0.44.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v0.44.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.21.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.21.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.21.0
 	go.opentelemetry.io/otel/exporters/prometheus v0.44.0
 	go.opentelemetry.io/otel/metric v1.21.0
 	go.opentelemetry.io/otel/sdk v1.21.0
@@ -44,16 +46,28 @@ require (
 )
 
 require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/Masterminds/goutils v1.1.1 // indirect
 	github.com/Masterminds/semver v1.5.0 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/Microsoft/hcsshim v0.11.4 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/containerd/containerd v1.7.11 // indirect
+	github.com/containerd/log v0.1.0 // indirect
+	github.com/cpuguy83/dockercfg v0.3.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/docker/distribution v2.8.2+incompatible // indirect
+	github.com/docker/docker v24.0.7+incompatible // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
 	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
 	github.com/evanphx/json-patch v5.6.0+incompatible // indirect
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
 	github.com/go-openapi/jsonpointer v0.19.6 // indirect
 	github.com/go-openapi/jsonreference v0.20.2 // indirect
 	github.com/go-openapi/swag v0.22.3 // indirect
@@ -63,41 +77,59 @@ require (
 	github.com/google/gnostic-models v0.6.8 // indirect
 	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
-	github.com/google/uuid v1.3.1 // indirect
+	github.com/google/uuid v1.4.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 // indirect
 	github.com/huandu/xstrings v1.4.0 // indirect
-	github.com/imdario/mergo v0.3.13 // indirect
+	github.com/imdario/mergo v0.3.16 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.16.5 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/moby/patternmatcher v0.6.0 // indirect
+	github.com/moby/sys/sequential v0.5.0 // indirect
+	github.com/moby/term v0.5.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.0-rc5 // indirect
+	github.com/opencontainers/runc v1.1.9 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
 	github.com/prometheus/client_model v0.5.0 // indirect
 	github.com/prometheus/common v0.45.0 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/shirou/gopsutil/v3 v3.23.11 // indirect
+	github.com/shoenig/go-m1cpu v0.1.6 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
+	github.com/yusufpapurcu/wmi v1.2.3 // indirect
 	go.opentelemetry.io/proto/otlp v1.0.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/oauth2 v0.13.0 // indirect
 	golang.org/x/sys v0.15.0 // indirect
 	golang.org/x/term v0.15.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/time v0.3.0 // indirect
+	golang.org/x/tools v0.16.0 // indirect
 	google.golang.org/appengine v1.6.8 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20231002182017-d307bd883b97 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20231002182017-d307bd883b97 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gotest.tools/v3 v3.5.1 // indirect
 	k8s.io/api v0.29.0 // indirect
 	k8s.io/klog/v2 v2.110.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20231010175941-2dd684a91f00 // indirect