Fix Helpers For Marshalling And Unmarshalling pcommon.Value

[mahadzaryab1]

Description

• This PR fixes the helpers for AnyValue by changing the API to accept pcommon.Value. Since otlpcommon.AnyValue is an internal type, the current helpers are not useful as a public API.

Link to tracking issue

Fixes #13837 (original issue #12826)

Testing

• Updated unit tests

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.63%. Comparing base (6cd9c4e) to head (81fa069).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pdata/xpdata/json.go	83.33%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (83.33%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13945      +/-   ##
==========================================
- Coverage   91.67%   91.63%   -0.04%     
==========================================
  Files         654      654              
  Lines       42658    42659       +1     
==========================================
- Hits        39106    39091      -15     
- Misses       2738     2750      +12     
- Partials      814      818       +4     

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[dmathieu]

Could you add a changelog entry?

[mahadzaryab1]

Could you add a changelog entry?

@dmathieu Done!

[dmathieu]

Fix: #13993

[mahadzaryab1]

@dmathieu is this PR good to go?

[dmathieu]

It needs review/merge by a maintainer.

[otelbot]

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