feat(exporter-metrics-otlp-proto): Support to protobuf in browser metrics

[YangJonghun]

Which problem is this PR solving?

Log, Trace support protobuf properly in browser, but Metric crashes because it references @opentelemetry/otlp-exporter-base/node-http.

Short description of the changes

• Meter Exporter supports protobuf in browser

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: YangJonghun / name: YangJH (6e0733b, 9f80a12)

[pichlermarc]

@YangJonghun thanks for working on this :)
Please also add an entry in experimental/CHANGELOG.md.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.03%. Comparing base (a9fc600) to head (6e0733b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5710   +/-   ##
=======================================
  Coverage   95.03%   95.03%           
=======================================
  Files         310      310           
  Lines        7998     7998           
  Branches     1615     1615           
=======================================
  Hits         7601     7601           
  Misses        397      397           

Files with missing lines	Coverage Δ
...otlp-proto/src/platform/node/OTLPMetricExporter.ts	100.00% <100.00%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[YangJonghun]

@pichlermarc
Thanks for your quick review. I've added an entry into the CHANGELOG.

[pichlermarc]

thanks!

[opentelemetrybot]

Thank you for your contribution @YangJonghun! 🎉 We would like to hear from you about your experience contributing to OpenTelemetry by taking a few minutes to fill out this survey.