cJSON update to 1.7.17

[graebm]

Pick up latest release

Did some things to make future updates even easier:

• moved cJSON.h next to cJSON.c, so we don't need to change the #include in the .c file
• mark customized lines with /* Amazon edit */.
• Only make additive edits. It's tough to diff when we've removed the original source code

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 (8eaa098) 83.35% compared to head (f449993) 83.35%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1081   +/-   ##
=======================================
  Coverage   83.35%   83.35%           
=======================================
  Files          56       56           
  Lines        5803     5803           
=======================================
  Hits         4837     4837           
  Misses        966      966           

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