Migrate FilterList to TypeScript

[colebemis]

This PR migrates the FilterList component to TypeScript as part of the TypeScript refactor.

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🦋 Changeset detected

Latest commit: f56f781

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@primer/components	Patch

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[hehex9]

found a mistake in doc, it mentioned that FilterList accepts small as props but in fact that should be the props of FilterList.Item (according to the source code), just in case you missed it.

[colebemis]

@hehex9 Good catch! Thank you ❤️