Feature: Tracing via OpenTelemetry

[xBlaz3kx]

Proposed changes

• Added tracing:
  • HTTP API tracing with otelgin (tracing is only enabled on the /v1 endpoints and is skipped for UI)
  • GRPC server and client tracing (internals) with otelgrpc
  • Custom store level tracing
• Added context to various interfaces as it is required in order to properly create/propagate traces/spans
• New config/env variable - tracing
• Added docker compose example setup with complete observability

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Todo

• Documentation update

Relates to #1694

[xBlaz3kx]

@vcastellm Mind taking a look? Id appreciate more insight on what could/should be included in tracing.
I can add those later, this serves as a good demo/base for future efforts.