Convert moveable package to TypeScript

[swissspidy]

Context

Summary

Relevant Technical Choices

• Defined the styled-components theme with TS.
• Added some custom type definitions under packages/moveable/src/typings (see to-do below)

To-do

Help needed with these:

• Fix any bugs
• Fix remaining type error when passing a ref to OriginalMoveable
• Figure out a solution so we can move packages/moveable/src/typings/*.d.ts to top-level typings/ folder instead. Otherwise it's a bit messy.

User-facing changes

N/A

Testing Instructions

• This is a non-user-facing change and requires no QA

This PR can be tested by following these steps:

Reviews

Does this PR have a security-related impact?

Does this PR change what data or activity we track or use?

Does this PR have a legal-related impact?

Checklist

• This PR addresses an existing issue and I have linked this PR to it in ZenHub
• I have tested this code to the best of my abilities
• I have verified accessibility to the best of my abilities (docs)
• I have verified i18n and l10n (translation, right-to-left layout) to the best of my abilities
• This code is covered by automated tests (unit, integration, and/or e2e) to verify it works as intended (docs)
• I have added documentation where necessary
• I have added a matching Type: XYZ label to the PR

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Fixes #12088

[googleforcreators-bot]

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[swissspidy]

Last lint error fixed, this should now be ready again.