feat: support shell completions in `tedge` cli #7184

Job	Run time
Block fixup commits	7s
Filter changes	2s
Check whether Cargo.lock is up to date	31s
Shellcheck	8s
Spell Check with Typos	5s
Run format checks	5m 10s
Run cargo clippy	45s
Run cargo test	8m 13s
Run cargo audit	20s
Run cargo check on MSRV	34s
Sort dependencies	2m 9s
Check for unused dependencies	1m 27s
Check markdown	18s
nightly / doc	45s
	20m 34s

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