Copybara import of the project:
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f56fd74efecc2cf6fbe6db70e91dfa7780fb9c68 by Mohammad <mohammaddevgermany@gmail.com>:
build(package): add py.typed and include it in flit config
This adds a py.typed marker file to the google.adk package and updates
the Flit configuration in pyproject.toml to include it in the distribution.
This ensures the package is PEP 561 compliant and allows static type
checkers (like mypy and pyright) to recognize that the package supports type hints.
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/913 from mohamadghaffari:add-py-typed f56fd74efecc2cf6fbe6db70e91dfa7780fb9c68
PiperOrigin-RevId: 764603119