Provide `py.typed`

[rgbkrk]

Is your feature request related to a problem? Please describe.

When this package is used from a workspace that uses mypy it will show up with the error:

Skipping analyzing "origami": module is installed, but missing library stubs or py.typed marker 

You wrote all these types! Let's make them usable for anyone using the SDK.

Describe the solution you'd like

One of the options that mypy recommends: https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-library-stubs-or-py-typed-marker

Describe alternatives you've considered

I have to put this in my pyproject.toml for the moment:

[[tool.mypy.overrides]]
module = "origami.client"
ignore_missing_imports = true

[[tool.mypy.overrides]]
module = "origami.defs.rtu"
ignore_missing_imports = true

[[tool.mypy.overrides]]
module = "origami.defs.deltas"
ignore_missing_imports = true

[[tool.mypy.overrides]]
module = "origami.defs.files"
ignore_missing_imports = true

Additional context

💙