Add keyboard shortcut for adding table rows

Describe your feature request

Add a keyboard shortcut for adding table rows. Possible common options are:

1. Tab at the last column of last row in table creates a new row and moves to it
2. Return (possibly with added modifier) creates a row below the current one and moves to it.

What problem does this feature solve? [optional]

Currently, adding table rows is very cumbersome, requiring mouse interaction.

[fxha]

Tab at the last column of last row in table creates a new row and moves to it

I think that this feature is a little bit problematic because it could confuse the user. I mean, I wouldn’t expect such a behavior.

I’m not sure what Cmd would translate to on Linux

It’s normally Ctrl+Enter but to insert a new row you have to use the meta key Super/Win and Enter.

https://github.com/marktext/marktext/blob/387d42822de38639b5c677b4000529d2a3be1166/src/muya/lib/contentState/enterCtrl.js#L260

[Jocs]

@tmr232 we already has a keyboard shortcut to add table row. Cmd + Enter. try to use it?