feat(commands): Add `mount` command #415

Job	Run time
Clippy (default)	32s
Build docs (stable, macos-latest)	19s
Build docs (stable, ubuntu-latest)	11s
Build docs (stable, windows-latest)	53s
Rustfmt	7s
Test (stable, default, macos-latest)	10s
Test (stable, default, ubuntu-latest)	27s
Test (stable, default, windows-latest)	20s
Result (CI)	0s
	2m 59s

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