[PoC][pdata/pcommon] - Enhance FromRaw method

[VihasMakwana]

Description

This PR enhances FromRaw method to support:

1. slices of supported types
   • For eg. if we pass a slice of []string, it will fail. But we support the string type
2. custom types that are maps
   • This is a special case when the user has defined a custom type, with map[string]any as the underlying type.
   • We use reflection to convert the type to map[string]any
3. We can optionally support time.Time by converting it to a ISO 8601 format string.

I'm happy to hear @bogdandrutu and @dmitryax's thoughts on this enhancement.

Testing

Will add testing if we decide to go forward with this change.

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.38%. Comparing base (75f20d4) to head (aa35490).
⚠️ Report is 39 commits behind head on main.

Files with missing lines	Patch %	Lines
pdata/pcommon/value.go	25.00%	15 Missing ⚠️

❌ Your patch check has failed because the patch coverage (25.00%) 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   #13810      +/-   ##
==========================================
- Coverage   91.42%   91.38%   -0.05%     
==========================================
  Files         640      640              
  Lines       42599    42687      +88     
==========================================
+ Hits        38946    39008      +62     
- Misses       2834     2857      +23     
- Partials      819      822       +3     

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