feat: remove vendored aws-lambda-cpp dependency

[maxday]

Issue #, if available:

Description of changes:

Target (OCI, Managed Runtime, both):

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.38%. Comparing base (b668333) to head (6cdbbdc).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #633   +/-   ##
=========================================
  Coverage     65.38%   65.38%           
  Complexity      212      212           
=========================================
  Files            34       34           
  Lines           991      991           
  Branches        143      143           
=========================================
  Hits            648      648           
  Misses          290      290           
  Partials         53       53           

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