[pdata] Deprecate pcommon.Map.Sort()

[dmitryax]

This method will be removed as it leaks the underlying implementation.
One of the following alternatives should be used instead:

• Map.AsRaw() if you need to compare two maps in tests.
• github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatatest module if you use Sort()
  to prepare other pdata objects for comparison.
• github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil module if you use Sort()
  to create Map identifiers.

Updates #6688

[codecov]

Codecov Report

Base: 90.67% // Head: 90.67% // No change to project coverage 👍

Coverage data is based on head (ad0647b) compared to base (d97f1eb).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6989   +/-   ##
=======================================
  Coverage   90.67%   90.67%           
=======================================
  Files         241      241           
  Lines       14525    14525           
=======================================
  Hits        13171    13171           
  Misses       1087     1087           
  Partials      267      267           

Impacted Files	Coverage Δ
pdata/pcommon/common.go	94.44% <ø> (ø)

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