feat(cli): add generation of manpages and shell completions

[seqre]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 84.41558% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cot-cli/src/main.rs	84.41%	11 Missing and 1 partial ⚠️

Flag	Coverage Δ
rust	81.10% <84.41%> (+0.26%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
cot-cli/src/main.rs	67.93% <84.41%> (+67.93%)	⬆️

... and 3 files with indirect coverage changes

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[m4tx]

LGTM