O11Y-992: OTEL Dart: Implement OTLP HTTP Reporter

[tylersnavely-wf]

This introduces the collector exporter.

An example setup would look like this:

final exporter = CollectorExporter(Uri.parse('https://h.wk-dev.wdesk.org/s/opentelemetry-collector/v1/traces'));
final provider = TracerProvider(processors: [BatchSpanProcessor(exporter)]);
final Tracer tracer = provider.getTracer('my-app', version: '0.1.0');

Notes:
Because this requires generated protobuf code, I've added the protobuf definitions as a submodule, and made make init generate the files.

[rmconsole-wf]

Merge Requirements Met ✅

Request Rosie to automerge this pull request by including @Workiva/release-management-p in a comment.

General Information

Ticket(s):

• O11Y-992 | remove

Code Review(s): #6
Release Image Tags:

Reviewers: tylerrinnan-wf, blakeroberts-wk, tylersnavely-wf

Additional Information

Watchlist Notifications: None

	When this pull is merged I will add it to the following release:
	Version: opentelemetry-dart 0.1.0
	Release Ticket(s): None

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Last updated on Wednesday, August 25 01:57 PM CST

[aviary3-wk]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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[blakeroberts-wk]

Rather than give a span the whole tracer, I think it makes sense to give the span resource and instrumentationLibrary attributes which can be serialized. This would be inline with the js version: https://github.com/open-telemetry/opentelemetry-js/blob/30733df5cbddb8bc60da5bc7a65f25a182f036d8/packages/opentelemetry-exporter-collector/src/transform.ts#L305-L324

[blakeroberts-wk]

mostly so we don't expose the api tracer.startSpan().tracer.StartSpan()

[tylersnavely-wf]

Good catch! We should correct this once https://jira.atl.workiva.net/browse/O11Y-994 is completed. I believe that has some work to include Resources, so we can easily adjust afterward.

[tylersnavely-wf]

QA +1

[tylersnavely-wf]

@Workiva/release-management-p

[rmconsole-wf]

+1 from RM