Fixes and polish for stable release

[misscoded]

Summary

Final preparations and polish prior to cutting a stable release. 💅🏼

• Makes inputs available by way of Context for interactivity events that are associated with a function's execution
• Added three function-related keys to the Context interface
• Surface proper errors if the functionExecutionId somehow goes missing when using a utility

Requirements (place an x in each [ ])

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.37838% with 8 lines in your changes missing coverage. Please review.

Project coverage is 81.58%. Comparing base (87730ef) to head (7ee465b).

Files	Patch %	Lines
src/App.ts	22.22%	6 Missing and 1 partial :warning:
src/middleware/builtin.ts	85.71%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@                Coverage Diff                 @@
##           feat-functions    #2128      +/-   ##
==================================================
+ Coverage           81.43%   81.58%   +0.15%     
==================================================
  Files                  19       19              
  Lines                1621     1640      +19     
  Branches              458      462       +4     
==================================================
+ Hits                 1320     1338      +18     
  Misses                194      194              
- Partials              107      108       +1     

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