[CDF-27549] Add AppIO resource loader for custom app deployment via App Hosting

[Magssch]

Description

Adds AppIO, the resource loader that enables cdf deploy to build and deploy custom
web apps to the CDF App Hosting API from an apps/ folder. Includes zip bundling,
lifecycle reconciliation, and alias management. Gated behind the CUSTOM_APPS feature
flag (hidden) while in development.

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Changelog

Added

• [alpha] Add support for deploying to CDF App Hosting using a apps/ resource folder.

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[Magssch]

/gemini review

[gemini-code-assist]

Code Review

This pull request adds support for custom app resources via the CDF App Hosting API and a new CUSTOM_APPS feature flag. Feedback identifies style guide violations regarding docstrings and type hints, and a logic error in zip filename generation.

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
42888	36836	86%	80%	🟢

New Files

File	Coverage	Status
cognite_toolkit/_cdf_tk/resource_ios/_resource_ios/app.py	94%	🟢
TOTAL	94%	🟢

Modified Files

File	Coverage	Status
cognite_toolkit/_cdf_tk/client/testing.py	100%	🟢
cognite_toolkit/_cdf_tk/feature_flags.py	100%	🟢
cognite_toolkit/_cdf_tk/resource_ios/init.py	83%	🟢
cognite_toolkit/_cdf_tk/resource_ios/_resource_ios/init.py	100%	🟢
TOTAL	96%	🟢

updated for commit: 281e0b2 by action🐍

[codecov]

Codecov Report

❌ Patch coverage is 94.08602% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.88%. Comparing base (a3e89c3) to head (281e0b2).

Files with missing lines	Patch %	Lines
..._toolkit/_cdf_tk/resource_ios/_resource_ios/app.py	93.88%	11 Missing ⚠️

Additional details and impacted files

@@                       Coverage Diff                       @@
##           cdf-27549-custom-apps-part2    #2987      +/-   ##
===============================================================
+ Coverage                        85.85%   85.88%   +0.03%     
===============================================================
  Files                              465      466       +1     
  Lines                            42702    42888     +186     
===============================================================
+ Hits                             36662    36836     +174     
- Misses                            6040     6052      +12     

Files with missing lines	Coverage Δ
cognite_toolkit/_cdf_tk/client/testing.py	100.00% <100.00%> (ø)
cognite_toolkit/_cdf_tk/feature_flags.py	100.00% <100.00%> (ø)
cognite_toolkit/_cdf_tk/resource_ios/__init__.py	83.33% <100.00%> (+0.57%)	⬆️
...kit/_cdf_tk/resource_ios/_resource_ios/__init__.py	100.00% <100.00%> (ø)
..._toolkit/_cdf_tk/resource_ios/_resource_ios/app.py	93.88% <93.88%> (ø)

... and 4 files with indirect coverage changes

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