Users CLI functionality

[beforan]

Pull Request Contents

♻️ Refactor
✨ Feature

Description

This PR adds a number of Users CLI actions, per #4 and the issues listed below.

It also refactors the CLI code a little, mainly to allow easy use of Spectre.Console's AnsiConsole capabilities. The main side effect is that dependeny injection service registration for the CLI is now primarily at an app level, not per command.

This simplifies some CLI command boilerplate (and injecting the AnsiConsole instances) but may later have a performance impact. But let's not prematurely optimise.

Related Issues or other material

• This PR relates to one or more issues, detailed below

• Related Issue Relay CLI enhancements #4
• Closes Relay CLI - Add Users should report subnode/collection id #17
• Closes Relay Users CLI - Reset User Password #20
• Closes Relay Users CLI - Add a subnode to an existing user #23
• Closes Relay Users CLI - List usernames #24
• Closes Relay Users CLI - List user's subnodes #25
• Closes Relay Users CLI - Ability to remove node + user #22

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