chore(boards2): move commondao & boards2 to "nt" namespace

[jeronimoalbi]

Follow up to discussion #3616 (comment)

[Gno2D2]

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[jeronimoalbi]

@leohhhn if we merge this PR, both commondao package and boards2 realm would be moved to the {p,r}/nt namespace

cc @x1unix

[leohhhn]

lgtm