fix: Custom start index for ordered lists (#1299), improved support for copy/pasting tables into speadsheets (#1298)

[areknawo]

This PR:

• adds support for ordered lists starting at any index (>=1), insertable with \d+\. shortcut; (list keyboard shortcut other than "1" #1299)
• adds support for exporting OL start attribute in HTML & MD output;
• fixes copy/pasting of tables into spreadsheet applications (like Excel/Google Sheets); (copy paste tables to excel / google sheets #1298)

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[YousefED]

seems like a good start, I see one major bug when creating a list

1. first item
2. second item

and then indenting the second item, the index shows as 1.

I also don't think we always want to export the list index to BlockNote JSON format. When I look at basic/block-objects example, now the index is always included. Imo we should only include it if there's an explicit (different from default) "start".

Not sure what the best approach for these two issues is. Perhaps we should keep index as-is, and include a start attribute only when needed?

[YousefED]

Couple of improvement points:

Discussed on slack:

• add tests
• make sure start doesn't show up for non-explicitly set list items

other:

• when starting a new list with 1., we shouldn't set start=1, as it's the default behavior
• found one bug with inconsistent data / UX, see recording:

Screen.Recording.2024-12-10.at.09.53.03.mov