feat: support event tracing

[hwjiangkai]

What problem does this PR solve?

support event tracing

enable related configurations in the gateway and trigger:

    observability:
      tracing:
        enable: false
        # OpenTelemetry Collector endpoint, https://opentelemetry.io/docs/collector/getting-started/
        otel_collector: http://127.0.0.1:4318
        event_tracing_enable: true
        # Vanus Controller endpoints
        event_collector: 
          - vanus-controller-0.vanus-controller.trace.svc.cluster.local:8080
          - vanus-controller-1.vanus-controller.trace.svc.cluster.local:8080
        eventbus: event-tracing

Issue Number: close #xxx

Problem Summary

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

[codecov]

Codecov Report

❌ Patch coverage is 50.52632% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.07%. Comparing base (ee76217) to head (daa31f6).
⚠️ Report is 108 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/gateway/gateway.go	55.00%	18 Missing ⚠️
internal/trigger/trigger/trigger.go	47.36%	10 Missing ⚠️
internal/gateway/proxy/proxy.go	0.00%	9 Missing ⚠️
internal/trigger/reader/reader.go	65.38%	8 Missing and 1 partial ⚠️
internal/gateway/proxy/deadletter.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #607      +/-   ##
==========================================
- Coverage   57.07%   54.07%   -3.00%     
==========================================
  Files         190      224      +34     
  Lines       15191    18125    +2934     
==========================================
+ Hits         8670     9801    +1131     
- Misses       5884     7534    +1650     
- Partials      637      790     +153     

Files with missing lines	Coverage Δ
internal/gateway/proxy/deadletter.go	0.00% <0.00%> (ø)
internal/gateway/proxy/proxy.go	22.94% <0.00%> (-0.15%)	⬇️
internal/trigger/reader/reader.go	75.15% <65.38%> (-0.03%)	⬇️
internal/trigger/trigger/trigger.go	64.70% <47.36%> (-2.04%)	⬇️
internal/gateway/gateway.go	55.26% <55.00%> (-12.41%)	⬇️

... and 85 files with indirect coverage changes

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