[BUGFIX] Fix FDS auto-complete for Conda installs

[Kilo59]

Conda packages currently are missing auto-complete for most of our FDS API.
This is because the conda package does not seem to be shipping with our .pyi stub files.

Example context.sources

This PR updates the MANIFEST.ini to include all .pyi files.
Updating MANFIEST.ini is not required as part of normal setuptools uploads, but this seems to be required for conda.

The package_data argument is a dictionary that maps from package names to lists of glob patterns. Note that the data files specified using the package_data option neither require to be included within a MANIFEST.in file, nor require to be added by a revision control system plugin.

• See a similar fix applied by @xhochy (our conda feedstock maintainer) [BUGFIX] Include all requirement files in the sdist #6292

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