feat(dev): add local Function App server

[trygveu]

Description

Adds cdf dev function serve for local Cognite Function App development. The command starts the Function Apps ASGI development server with Toolkit authentication in either default reload or --no-reload mode.

The command is protected by the hidden FUNCTION_APPS alpha flag. Enable it in cdf.toml:

[alpha_flags]
function_apps = true

Install its optional dependencies with:

uv sync --extra serve

Safety and behavior

• Refuses to start against CDF_BUILD_TYPE=prod.
• Validates that the target is a Function App handler.
• Keeps reload imports scoped to the handler directory and cleans temporary state on all tested failure paths.
• Uses Toolkit environment authentication for local requests.

Validation

• uv run pytest tests/test_unit -n8 — 3260 passed, 32 skipped
• Focused command and feature-flag tests — 11 passed
• uv run ruff check ... and uv run mypy ...
• uv run pre-commit run --show-diff-on-failure --color=always --all-files
• Real sibling Function App smoke with --no-reload: /internal/health and /docs return 200
• Real sibling Function App smoke with reload: /internal/health and /docs return 200
• Editing a disposable handler.py copy triggers reload and serves health successfully afterward

Coverage note

Coverage cannot currently collect any Toolkit tests in this environment: pytest-cov fails before collection while the existing Pandas/NumPy import chain initializes (numpy: cannot load module more than once per process). The ordinary full test suite is unaffected.

Bump

• Patch
• Skip

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