[chore] [pdata] Split Value/Map/Slice into separate files

[dmitryax]

For better readability

[codecov]

Codecov Report

Base: 89.33% // Head: 89.33% // No change to project coverage 👍

Coverage data is based on head (daf4713) compared to base (a2f0153).
Patch coverage: 96.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7083   +/-   ##
=======================================
  Coverage   89.33%   89.33%           
=======================================
  Files         239      241    +2     
  Lines       13989    13989           
=======================================
  Hits        12497    12497           
  Misses       1221     1221           
  Partials      271      271           

Impacted Files	Coverage Δ
pdata/pcommon/value.go	94.23% <ø> (ø)
pdata/pcommon/map.go	94.15% <94.15%> (ø)
pdata/pcommon/slice.go	100.00% <100.00%> (ø)

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