chore(boards2): add txtar and improve CreateBoard doc

[n0izn0iz]

Add a sanity check txtar that tests:

• Board creation
• Member invite
• Thread creation
• Reply
• Member removal

Also improves the doc of CreateBoard to be explicit about board name constraints

The txtar can be vastly improved but it's a good base IMO

[Gno2D2]

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[moul]

we should not do this. But i think Txtar can pretend being @devx or @moul, cc @gfanton.

[jeronimoalbi]

It would be great if we could delete this line, otherwise we should remove the @test123 user each time after deploying boards

[jeronimoalbi]

Still think we should aim to remove the @test123 user from the initial list of board realm admins to avoid potential security issues if the user is not removed right after boards realm is deployed

[n0izn0iz]

I could do something similar to govdao txtars, will investigate, don't merge