Add synchronization to SimpleLogRecordProcessor and SimpleSpanProcessor to ensure thread-safe export of logs and spans respectively

[slodha]

Resolves #6681

[linux-foundation-easycla]

• ✅login: slodha / (c56de26)

The committers listed above are authorized under a signed CLA.

[breedx-splk]

Resolves #6681

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.31%. Comparing base (ca98fc5) to head (c56de26).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6885   +/-   ##
=========================================
  Coverage     90.30%   90.31%           
  Complexity     6589     6589           
=========================================
  Files           729      729           
  Lines         19767    19773    +6     
  Branches       1944     1944           
=========================================
+ Hits          17851    17857    +6     
  Misses         1325     1325           
  Partials        591      591           

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[trask]

thanks!

[jack-berg]

Thanks!