Deprecate pdata Clone methods in favor of CopyTo

[dmitryax]

Resolves #6154

[codecov]

Codecov Report

Base: 91.76% // Head: 91.77% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (996f9bd) compared to base (380f1b1).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6164   +/-   ##
=======================================
  Coverage   91.76%   91.77%           
=======================================
  Files         218      218           
  Lines       13352    13358    +6     
=======================================
+ Hits        12253    12259    +6     
  Misses        870      870           
  Partials      229      229           

Impacted Files	Coverage Δ
pdata/plog/logs.go	96.55% <100.00%> (+0.25%)	⬆️
pdata/pmetric/metrics.go	75.45% <100.00%> (+0.45%)	⬆️
pdata/ptrace/traces.go	81.81% <100.00%> (+1.17%)	⬆️

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[bogdandrutu]

There should be some usages of these funcs?

Fine to do it in the next PR.