OTLP registry emitter

[jerbly]

First iteration of the new command: registry emit. Emits a semantic convention registry as example spans to your OTLP receiver. This may be useful in testing/simulation scenarios. Defaults to http://localhost:4317 if the OpenTelemetry standard OTEL_EXPORTER_OTLP_ENDPOINT env var is unset.

With this command:

weaver registry emit

A single trace with all defined spans in the current Semantic Conventions are sent to the receiver:

Spans:

• Emit all defined spans for the registry in a single trace.
• Use standard OpenTelemetry libraries for real-world compatibility
• Write tests using a custom Exporter
• Generate examples from the resolved examples in the registry
• Use the correct span_kind

A future PR will cover:

• Generate examples for template types (correctness issues prevent this: Proposal: Template types - allow mixed types and define type-safe examples semantic-conventions#1740)
• Adhere to conditionally_required clause (programmatically doing this, is not possible)
• Emit all defined metrics for the registry.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.6%. Comparing base (d616ff9) to head (9a41168).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #549   +/-   ##
=====================================
  Coverage   74.6%   74.6%           
=====================================
  Files         51      51           
  Lines       3965    3965           
=====================================
+ Hits        2958    2959    +1     
+ Misses      1007    1006    -1     

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