feat: Table cell rowspan/colspan in API

[1cybersheep1]

Summary: This PR introduces support for rowspan and colspan properties in the API, laying the foundation for future cell merging functionality.

Details:

• Added rowspan and colspan parameters to the CellContent and PartialCellContent types.
• Integrated these parameters into nodeConversion, with default values set to 1.

Why: Supporting rowspan and colspan is essential for enabling merged cells, which will enhance the user experience by allowing more complex and dynamic table structures.

Additional Notes:

• This PR targets the current branch since I think it makes sense to merge them together.
• The naming convention of the parameters (rowspan and colspan) can be adjusted based on feedback.

Fixes #972

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Sep 6, 2024 7:37pm

[vercel[bot]]

@1cybersheep1 is attempting to deploy a commit to the TypeCell Team on Vercel.

A member of the Team first needs to authorize it.

[nperez0111]

This has already been resolved