refactor: Use JSON files for TraceExporter client initialization

[kmimu]

This PR addresses the issue mentioned in Issue #404 by implementing the suggested Option 2

• Refactored TraceExporter client initialization
• Replaced direct proto file references with JSON files
• Converted proto files to JSON using the npm run compile-protos command

Checks:

• [x] Make sure to open an issue as a bug/issue/feature before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• [x] Ensure the tests and linter pass
• [x] Code coverage does not decrease (if any source code was changed)
• [x] Appropriate docs were updated (if necessary)

Fixes #404

[MichaelDoyle]

@aabmass would you be able to take a look at this?

[aabmass]

/gcbrun

[kmimu]

@aabmass Thanks for your initial review! I’ve addressed all the comments, and I’d really appreciate it if you could take another look when you have a chance.

[aabmass]

/gcbrun

[aabmass]

/gcbrun

[aabmass]

PR looks good, just need to fix https://github.com/GoogleCloudPlatform/opentelemetry-operations-js/issues/755 before we merge

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.72%. Comparing base (7f1ee19) to head (212f314). Report is 39 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #741 +/- ## ======================================= Coverage 97.72% 97.72% ======================================= Files 18 18 Lines 703 704 +1 Branches 136 136 ======================================= + Hits 687 688 +1 Misses 16 16 ```

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[aabmass]

/gcbrun