fix: Hard break keyboard shortcut not working in custom blocks

[matthewlipski]

closes https://github.com/TypeCellOS/BlockNote/pull/1554

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[YousefED]

@nperez0111 @matthewlipski let's maybe also think through whether this should be configurable or not.

• Do we want to make it easy to make custom blocks where shift+enter doesn't insert a break? (do we see use cases for this)?
• Do we want to make it easy to make custom blocks where just enter inserts a break? (do we see use cases for this)?

[nperez0111]

True, yea let's discuss what we want here,

I've seen a lot of stuff lately around custom blocks & newline behaviour:

• https://github.com/TypeCellOS/BlockNote/issues/1551

[matthewlipski]

I added a proposal for configuring the hard break shortcut behaviour in the most recent commit. Lmk if it seems ok!

[YousefED]

@matthewlipski can you add docs for this + comment the BlockConfig in the code? (let's make this standard practice)

[sentry[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TransformError: Cannot join blockGroup onto blockContainer /examples/custom-schema/alert-block View Issue

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