feat(otlp-transformer)!: remove internal types and functions from public API

[pichlermarc]

Which problem is this PR solving?

Removes all types that don't need to be exported anymore from the public interface. They were previously private as the serialization was handled by exporters, but that has changed since #4581 and #4542 were merged. Now we don't need to make the intermediate representation public anymore since the interface takes the SDKs representation and then directly returns an Uint8Array that can immediately be sent.

Reducing the public API in this way is a key part to making @opentelemetry/otlp-transformer stable, see #4582

Fixes #4583

Breaking changes

• (user-facing): the following types and functions were intended for internal use and have been removed from exports
  • OtlpEncodingOptions
  • IKeyValueList
  • IKeyValue
  • IInstrumentationScope
  • IArrayValue
  • LongBits
  • IAnyValue
  • Fixed64
  • SpanContextEncodeFunction
  • toLongBits
  • OptionalSpanContextEncodeFunction
  • getOtlpEncoder
  • Encoder
  • HrTimeEncodeFunction
  • encodeAsLongBits
  • encodeAsString
  • hrTimeToNanos
  • IValueAtQuantile
  • ISummaryDataPoint
  • ISummary
  • ISum
  • IScopeMetrics
  • IResourceMetrics
  • INumberDataPoint
  • IHistogramDataPoint
  • IHistogram
  • IExponentialHistogramDataPoint
  • IExponentialHistogram
  • IMetric
  • IGauge
  • IExemplar
  • EAggregationTemporality
  • IExportMetricsServiceRequest
  • IBuckets
  • IResource
  • IStatus
  • EStatusCode
  • ILink
  • IEvent
  • IScopeSpans
  • ISpan
  • IResourceSpans
  • ESpanKind
  • IExportTraceServiceRequest
  • IScopeLogs
  • IExportLogsServiceRequest
  • IResourceLogs
  • ILogRecord
  • ESeverityNumber

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

• Unit tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.58%. Comparing base (fd7f2d9) to head (fb0d6dc).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5200      +/-   ##
==========================================
- Coverage   94.59%   94.58%   -0.02%     
==========================================
  Files         314      314              
  Lines        7993     7993              
  Branches     1611     1611              
==========================================
- Hits         7561     7560       -1     
- Misses        432      433       +1     

Files with missing lines	Coverage Δ
.../packages/otlp-transformer/src/json/serializers.ts	100.00% <ø> (ø)
...kages/otlp-transformer/src/protobuf/serializers.ts	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

[trentm]

The otlp-transformer/README.md still describes using:

import {
  createExportTraceServiceRequest,
  createExportMetricsServiceRequest,
  createExportLogsServiceRequest,
} from '@opentelemetry/otlp-transformer';
...

That should be updated, but doesn't have to block this.

[pichlermarc]

@trentm good point - addressed in fb0d6dc 🙂

I'll also hold of on merging this until I have a PR for open-telemetry/opentelemetry-js-contrib#2565 so that we don't run into trouble when updating the contrib repo where these types are used in some tests.

[trentm]

where these types are used in some tests.

Ah, I hadn't checked for usage in the contrib repo.

[pichlermarc]

added the blocked label so we don't merge this before open-telemetry/opentelemetry-js-contrib#2565