Change list of match ids to set for json_handler.py

[cmclel7]

Increase the speed of the json_handler by migrating from a list to a set. Move from O(n) to O(1)

Issue #, if available:

Description of changes:

PR Checklist:

• Changelog updated
• Unit tests (and integration tests if applicable) provided
• All tests pass
• Pre-commit checks pass
• Debugging code removed
• If releasing a new version, have you bumped the version in the main CFN template?

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 ✅

Comparison is base (2d7fd40) 99.71% compared to head (30657c5) 99.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #395   +/-   ##
=======================================
  Coverage   99.71%   99.71%           
=======================================
  Files          31       31           
  Lines        1742     1742           
=======================================
  Hits         1737     1737           
  Misses          5        5           

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