feat: Log SSH commands

[qrichert]

@NobodyXu

As per #174.

This PR adds logging for the actual SSH commands through the tracing crate.
The result looks like this:

Regular:

2025-01-08T19:09:46.223524Z DEBUG openssh::process_impl::command: 54: cmd="ssh" "-S" "/Users/Quentin/.local/state/.ssh-connectionguuxlv/master" "-o" "BatchMode=yes" "-T" "-p" "9" "none" "--" "ls" "-rtl"

Multiplex:

2025-01-08T19:08:44.459856Z DEBUG openssh::native_mux_impl::command: 77: cmd="ls -rtl"

Closes #174

[jonhoo]

This change is 

[NobodyXu]

Thank you!

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.61%. Comparing base (bacc76d) to head (9286fa8).
Report is 23 commits behind head on master.

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Additional details and impacted files

Files with missing lines	Coverage Δ
src/native_mux_impl/command.rs	100.00% <100.00%> (+1.69%)	⬆️
src/process_impl/command.rs	100.00% <100.00%> (+2.32%)	⬆️

... and 13 files with indirect coverage changes