Add py.typed file to indicate type hints

[simonw]

I had to add this to mypy.ini in LLM:

[mypy-sqlite_migrate.*]
ignore_missing_imports = True

[simonw]

It has type hints, and mypy is running in CI:

sqlite-migrate/.github/workflows/test.yml

Lines 28 to 32 in 613ecd5

	- name: Run linters
	run: |
	mypy sqlite_migrate tests
	black --check .
	ruff .

I think it just needs a sqlite_migrate/py.typed empty file.

[simonw]

I'm going to remove that ignore_missing_imports = True from the LLM mypy.ini file and see if everything passes both before and after this change.

[simonw]

Huh, I can't recreate the original bug - even if I remove this from mypy.ini in LLM:

[mypy-sqlite_migrate.*]
ignore_missing_imports = True

I can run mypy llm without any errors.

[simonw]

I added that to the mypy.ini file there in simonw/llm@77cf56e#diff-6f2d4ba9ca9a357d31014946667b7bed1bfdbc6d2530afc77778fa0a36bee457 on Aug 27, 2023 - depending directly on sqlite-migrate which at the time was on version 0.1a1 https://github.com/simonw/sqlite-migrate/releases/0.1a1

But even that version had the type annotations: https://github.com/simonw/sqlite-migrate/blob/0.1a1/sqlite_migrate/__init__.py - and very few changes relating to them since then: 0.1a1...9830fcd#diff-73f939eb448b54b735ba472874215bcb06c30756488c8210a9b64de7ac0bf92f

So I'm not able to replicate the reason I opened this issue.

I don't want to spend more time on this so I'll chalk it up to mystery and add the py.typed file and move on.