Add support for built-in constant NaN

[Luna-Klatzer]

What type of change does this PR perform?

• Info or documentation change (Non-breaking change that updates repo info files (e.g. README.md, CONTRIBUTING.md, etc.) or online documentation)
• Website (Change that changes the design or functionality of the websites or docs)
• Development or internal changes (These changes do not add new features or fix bugs, but update the code in other ways)
• Bug fix (Non-breaking change which fixes an issue)
• New feature (Non-breaking change which adds functionality)
• Breaking change (Major bug fix or feature that would cause existing functionality not to work as expected.)
• Requires a documentation update, as it changes language or compiler behaviour

Summary

Added support for built-in support NaN, which simply represents NaN in the JavaScript and TypeScript target.

Closes #671

Detailed Changelog

Not present for website/docs changes

Added

• Implemented constant NaN, which represents the NaN value in JavaScript (Not a Number). (#671)

Does this PR create new warnings?

None.

Linked issues or PRs

• [Feature] Add built-in constant NaN #671

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.98%. Comparing base (9117107) to head (0c1b89d).

Additional details and impacted files

@@             Coverage Diff              @@
##           dev-next     #676      +/-   ##
============================================
+ Coverage     83.92%   83.98%   +0.05%     
============================================
  Files           270      270              
  Lines          4499     4502       +3     
  Branches        478      479       +1     
============================================
+ Hits           3776     3781       +5     
  Misses          582      582              
+ Partials        141      139       -2     

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