fix(core): onDrop and onPaste only registered when defined #5681

[nperez0111]

Changes Overview

This updates the onDrop and onPaste event callbacks to only ever be registered if they exist on the editor instance at creation. It also refactors them to be extensions rather than separate Prosemirror plugins which would causes plugins to be destroyed and recreated immediately

Implementation Approach

Testing Done

Verification Steps

Additional Notes

Checklist

• [ ] I have created a changeset for this PR if necessary.
• [ ] My changes do not break the library.
• [ ] I have added tests where applicable.
• [ ] I have followed the project guidelines.
• [ ] I have fixed any lint issues.

Related Issues

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Latest commit: dcacb0ea10616f6239fcee94a6a721e92da25a72

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