feat: distributed tracing

[solnic]

This adds support for distributed tracing via sentry-trace information using a new OpenTelemetry Propagator.

It is based on initial work done by @venkatd that he shared over here 🙇🏻 💜

Configuration

There's a new config that's now needed to set up the Propagator:

config :opentelemetry,
  text_map_propagators: [
    :trace_context,
    :baggage,
    Sentry.OpenTelemetry.Propagator
  ]

Screenshots

#skip-changelog

Closes #927
Closes #923

[github-actions]

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