Add @dmitryax as code owner to several components (#6524)

Splunk's exporters, couple orphaned receivers and internal/kubelet module

.github/CODEOWNERS

@@ -36,9 +36,9 @@ exporter/newrelicexporter/                           @open-telemetry/collector-c
 exporter/observiqexporter/                           @open-telemetry/collector-contrib-approvers @binaryfissiongames
 exporter/sapmexporter/                               @open-telemetry/collector-contrib-approvers @owais @dmitryax
 exporter/sentryexporter/                             @open-telemetry/collector-contrib-approvers @AbhiPrasad
-exporter/signalfxexporter/                           @open-telemetry/collector-contrib-approvers @pmcollins @asuresh4
+exporter/signalfxexporter/                           @open-telemetry/collector-contrib-approvers @pmcollins @asuresh4 @dmitryax
 exporter/skywalkingexporter/                         @open-telemetry/collector-contrib-approvers @liqiangz
-exporter/splunkhecexporter/                          @open-telemetry/collector-contrib-approvers @atoulme
+exporter/splunkhecexporter/                          @open-telemetry/collector-contrib-approvers @atoulme @dmitryax
 exporter/stackdriverexporter/                        @open-telemetry/collector-contrib-approvers @aabmass @dashpole @jsuereth @punya @tbarker25
 exporter/googlecloudexporter/                        @open-telemetry/collector-contrib-approvers @aabmass @dashpole @jsuereth @punya @tbarker25
 exporter/sumologicexporter/                          @open-telemetry/collector-contrib-approvers @pmm-sumo @sumo-drosiek
@@ -58,6 +58,7 @@ internal/aws/                                        @open-telemetry/collector-c
 internal/docker/                                     @open-telemetry/collector-contrib-approvers @mstumpfx @rmfitzpatrick
 
 internal/k8sconfig/                                  @open-telemetry/collector-contrib-approvers @pmcollins @asuresh4
+internal/kubelet/                                    @open-telemetry/collector-contrib-approvers @dmitryax
 internal/splunk/                                     @open-telemetry/collector-contrib-approvers @pmcollins @asuresh4
 internal/stanza/                                     @open-telemetry/collector-contrib-approvers @djaglowski
 
@@ -82,7 +83,9 @@ receiver/cloudfoundryreceiver/                       @open-telemetry/collector-c
 receiver/collectdreceiver/                           @open-telemetry/collector-contrib-approvers @owais
 receiver/dockerstatsreceiver/                        @open-telemetry/collector-contrib-approvers @rmfitzpatrick
 receiver/dotnetdiagnosticsreceiver/                  @open-telemetry/collector-contrib-approvers @pmcollins @davmason
+receiver/fluentforwardreceiver/                      @open-telemetry/collector-contrib-approvers @dmitryax
 receiver/jmxreceiver/                                @open-telemetry/collector-contrib-approvers @rmfitzpatrick
+receiver/kafkametricsreceiver/                       @open-telemetry/collector-contrib-approvers @dmitryax
 receiver/k8sclusterreceiver/                         @open-telemetry/collector-contrib-approvers @asuresh4
 receiver/k8seventsreceiver/                          @open-telemetry/collector-contrib-approvers @dmitryax
 receiver/kubeletstatsreceiver/                       @open-telemetry/collector-contrib-approvers @pmcollins @asuresh4