Add initial support for Function Call types

[avillega]

This PR implements the first part of this proposal #120. It focuses mostly in bringing the FC concepts to the api surface, future PR will bring this concept deeper into the architecture.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.49123% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.71%. Comparing base (4da10af) to head (ebc77b7).

Files	Patch %	Lines
lib/resonate.ts	90.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
+ Coverage   82.44%   82.71%   +0.27%     
==========================================
  Files          22       23       +1     
  Lines        1401     1429      +28     
  Branches      377      384       +7     
==========================================
+ Hits         1155     1182      +27     
- Misses        240      241       +1     
  Partials        6        6              

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