fix: replace otlp exporter with local implementation

[mrstork]

Summary

• Replaces the JsonTraceSerializer with a local implementation to suit our needs more directly
• Saves ~15ms in functions along tracing and non-tracing paths
• node_module size: ~26mb -> ~12mb

Before:

6.28mb @opentelemetry/otlp-transformer
5.96mb @opentelemetry/semantic-conventions
2.82mb protobufjs
2.4mb  @types/node
1.89mb @opentelemetry/sdk-metrics
1.19mb @opentelemetry/api
0.88mb @opentelemetry/core
0.77mb @opentelemetry/sdk-trace-base
0.63mb @opentelemetry/instrumentation
0.55mb @opentelemetry/resources
0.53mb acorn
0.41mb @opentelemetry/sdk-logs
0.4mb  @opentelemetry/api-logs
0.17mb require-in-the-middle
0.15mb resolve
0.14mb @opentelemetry/propagator-b3
0.13mb cjs-module-lexer
0.13mb long
0.12mb import-in-the-middle
0.1mb  semver

After:

5.96mb @opentelemetry/semantic-conventions
1.19mb @opentelemetry/api
0.88mb @opentelemetry/core
0.77mb @opentelemetry/sdk-trace-base
0.63mb @opentelemetry/instrumentation
0.55mb @opentelemetry/resources
0.53mb acorn
0.2mb  @opentelemetry/api-logs
0.17mb require-in-the-middle
0.15mb resolve
0.14mb @opentelemetry/propagator-b3
0.13mb cjs-module-lexer
0.12mb import-in-the-middle
0.1mb  semver
0.08mb @opentelemetry/propagator-jaeger
0.06mb @opentelemetry/context-async-hooks
0.04mb debug
0.03mb @opentelemetry/sdk-trace-node
0.03mb acorn-import-attributes
0.03mb function-bind