fix(opentelemetry-sdk-node): add missing @opentelemetry/otlp-exporter-base dependency

[gotgenes]

Which problem is this PR solving?

@opentelemetry/sdk-node imports CompressionAlgorithm from @opentelemetry/otlp-exporter-base in src/utils.ts (added in #6407), but the dependency is not declared in the package's package.json. This causes a runtime Cannot find module error under strict package managers like pnpm that do not hoist transitive dependencies.

Fixes #6519

Short description of the changes

• Add "@opentelemetry/otlp-exporter-base": "0.213.0" to dependencies in experimental/packages/opentelemetry-sdk-node/package.json
• Add changelog entry in experimental/CHANGELOG.md

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Verified that @opentelemetry/sdk-node@0.213.0 fails to start under pnpm strict isolation without this fix
• Verified that adding the dependency via pnpm.packageExtensions (our current workaround) resolves the error
• Confirmed by git blame that the import was introduced in commit 2f7c372 (feat(opentelemetry-sdk-node): set log provider for experimental start #6407) without a corresponding package.json update

Checklist:

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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: gotgenes / name: Chris Lasher (05c28f7)
• ✅ login: pichlermarc / name: Marc Pichler (a663801, ccffea7)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.73%. Comparing base (e9831e7) to head (ccffea7).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6520      +/-   ##
==========================================
- Coverage   95.75%   95.73%   -0.02%     
==========================================
  Files         364      364              
  Lines       12096    12104       +8     
  Branches     2885     2887       +2     
==========================================
+ Hits        11582    11588       +6     
- Misses        514      516       +2     

see 1 file with indirect coverage changes

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[otelbot]

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

[gotgenes]

Thank you, @pichlermarc!