[client] Add env and status flags for netbird service command

[lixmal]

Describe your changes

• Adds a netbird service install --service-env flag to add permanent env vars
• Adds a netbird service reconfigure [flags] command to reconfigure an already installed service
• Adds a netbird service status command
• Refactors common logic
• Add tests

Issue ticket number and link

Stack

Checklist

• [ ] Is it a bug fix
• [ ] Is a typo/documentation fix
• [x] Is a feature enhancement
• [ ] It is a refactor
• [ ] Created tests that fail without the change (if possible)
• [ ] Extended the README / documentation, if necessary

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