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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[n0izn0iz]

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

[n0izn0iz]

removed test admin and added patchpkg in txtar instead

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This PR is stale because it has been open 3 months with no activity. Remove stale label or comment or this will be closed in 3 months.