feat(CLI): add command line client interface

[ShadowApex]

This change adds a simple command-line interface to InputPlumber to expose some basic functionality that we can expand on in the future. The new interface allows inputplumber to run as a client to execute dbus methods to provide a more user-friendly way to interact with the InputPlumber service.

Examples

$ ./inputplumber help
Open source input manager for Linux

Usage: inputplumber [COMMAND]

Commands:
  run      Start the InputPlumber daemon (default)
  sources  Manage source input devices
  device   Manage a composite device
  devices  Manage composite devices
  targets  Manage target input devices
  help     Print this message or the help of the given subcommand(s)

Options:
  -h, --help     Print help
  -V, --version  Print version

$ ./inputplumber devices list
╭────┬─────────────────────────╮
│ Composite Devices            │
├────┼─────────────────────────┤
│ Id │ Name                    │
├────┼─────────────────────────┤
│ 0  │ Microsoft X-Box 360 pad │
╰────┴─────────────────────────╯
Found 1 composite device(s)

$ ./inputplumber device 0 load-profile ~/Projects/InputPlumber/rootfs/usr/share/inputplumber/profiles/default.yaml
Successfully loaded profile: ~/Projects/InputPlumber/rootfs/usr/share/inputplumber/profiles/default.yaml

[github-actions]

🎉 This PR is included in version 0.43.0 🎉

The release is available on:

• v0.43.0
• GitHub release

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