feat: add experimental require_file function to mark externally mounted files as required at runtime

[dionhaefner]

Relevant issue or PR

Another option to implement the functionality from #254. Not saying this is the way to go, but perhaps it can guide the discussion on which design we're looking for.

Description of changes

• Add tesseract_core.runtime.experimental.require_file function that Tesseract creators can use to mark files as required at runtime, but not at build time.

Testing done

CI

[codecov]

Codecov Report

❌ Patch coverage is 40.90909% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.51%. Comparing base (8d409fe) to head (bdc51ba).

Files with missing lines	Patch %	Lines
tesseract_core/runtime/cli.py	46.15%	5 Missing and 2 partials ⚠️
tesseract_core/runtime/experimental.py	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #261      +/-   ##
==========================================
- Coverage   78.08%   77.51%   -0.57%     
==========================================
  Files          29       29              
  Lines        3253     3274      +21     
  Branches      506      511       +5     
==========================================
- Hits         2540     2538       -2     
- Misses        486      504      +18     
- Partials      227      232       +5     

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[xalelax]

LGTM!

[dionhaefner]

Thanks @llueg!