Support extracting X-Ray Trace Header Lambda Invoke Store

[jj22ee]

Issue #, if available:

• Also see: chore(middleware-recursion-detection): read TraceID from Lambda Invoke Store aws-sdk-js-v3#7293

Description of changes:

• Extract Trace Header from Lambda Invoke Store, prioritized over Environment variable.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.31%. Comparing base (7bd6075) to head (ec63e26).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #722      +/-   ##
==========================================
+ Coverage   84.28%   84.31%   +0.02%     
==========================================
  Files          36       36              
  Lines        1814     1817       +3     
==========================================
+ Hits         1529     1532       +3     
  Misses        285      285              

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