revert(otlp-transformer): undo migration to protobuf-es

[overbalance]

PR for discussion of issue #6221

Protobuf revert

• Revert the migration to protobuf-es in otlp-transformer package
• Add missing @typescript/vfs peer dependency to instrumentation-grpc

Test plan

• Run existing unit tests
• Verify protobuf serialization works correctly
• Run benchmark to confirm performance characteristics

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.40%. Comparing base (b616ae1) to head (3383d59).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6225      +/-   ##
==========================================
- Coverage   95.40%   95.40%   -0.01%     
==========================================
  Files         317      317              
  Lines        9540     9518      -22     
  Branches     2205     2194      -11     
==========================================
- Hits         9102     9081      -21     
+ Misses        438      437       -1     

Files with missing lines	Coverage Δ
...ntal/packages/otlp-transformer/src/common/utils.ts	100.00% <100.00%> (+2.43%)	⬆️
...tal/packages/otlp-transformer/src/logs/internal.ts	100.00% <100.00%> (ø)
...ackages/otlp-transformer/src/logs/protobuf/logs.ts	100.00% <100.00%> (ø)
.../packages/otlp-transformer/src/metrics/internal.ts	100.00% <100.00%> (ø)
...s/otlp-transformer/src/metrics/protobuf/metrics.ts	100.00% <100.00%> (ø)
...al/packages/otlp-transformer/src/trace/internal.ts	98.59% <100.00%> (ø)
...kages/otlp-transformer/src/trace/protobuf/trace.ts	100.00% <100.00%> (ø)

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[trentm]

Looks good. Thanks for having this ready. I didn't check carefully that it restored the state before.

[trentm]

This is odd, but it was indeed in the original state of the file.

[overbalance]

I rolled back the commits verbatim. This quirk was restored along with a few unused tsconfig variables.

[trentm]

Approved, though this is still in draft. Discussion on whether we want this (we do) is here: #6221 (comment)