WIP: New built-in step Add Canvas to Channel Tab, changes to function generation

[filmaj]

WIP! Do not merge/release before Oct 16.

• expose new title output parameter on create canvas and channel create canvas steps,
• canvas_update_content step now calls backwards-compatible canvas_update_content_v2 step under the hood. add support for "id aliases" in function generation to manage these sorts of transitions.

[codecov]

Codecov Report

Attention: Patch coverage is 98.76543% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.54%. Comparing base (834464d) to head (4774f88).

Files with missing lines	Patch %	Lines
...ma/slack/functions/_scripts/src/templates/utils.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #367   +/-   ##
=======================================
  Coverage   98.54%   98.54%           
=======================================
  Files          67       68    +1     
  Lines        2742     2817   +75     
  Branches      148      149    +1     
=======================================
+ Hits         2702     2776   +74     
- Misses         40       41    +1     

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