Have aibs-informatics-cdk-lib pkg indicate that it is typed

Currently, due to a missing `py.typed` file, this package will
will raise mypy typing errors when used as a dependency in
some other package.

This commit fixes this issue by adding the missing file and
updating the `pyproject.toml` to include the `py.typed` file
as part of `package_data`.

For details see:
https://mypy.readthedocs.io/en/stable/installed_packages.html#creating-pep-561-compatible-packages

pyproject.toml

@@ -32,6 +32,9 @@ dev = [
 [tool.setuptools.dynamic]
 version = {attr = "aibs_informatics_cdk_lib._version.__version__"}
 
+[tool.setuptools.package-data]
+"*" = ['py.typed']
+
 [tool.setuptools.packages.find]
 where = ["src"]