feat(boards2): add views to list board members

[jeronimoalbi]

PR adds two new views to list realm or board members:

• /r/nt/boards2/v1:members
• /r/nt/boards2/v1:BOARD_NAME/members

Views list the member address and assigned role.

[Gno2D2]

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[jeronimoalbi]

cc @michelleellen

[jeronimoalbi]

This PR requires #3806 to be accepted and merged first

[jeronimoalbi]

@x1unix this PR is ready for review 🙏

[jeronimoalbi]

Moving to draft so I can add menu entries to list members

[jeronimoalbi]

The related PR has been merged so this PR can be reviewed already