`clap_man` should respect the various `Hide` attributes

[epage]

Please complete the following tasks

• [X] I have searched the discussions
• [X] I have searched the existing issues

Rust Version

rustc 1.57.0 (f1edd0429 2021-11-29)

Clap Version

v3.0.6

Minimal reproducible code

TBD

Steps to reproduce the bug with the above code

TBD

Actual Behaviour

We show everything

Expected Behaviour

We only show what the user allowed

Additional Context

Split out of #3174

Examples

• Hide possible values
• Hide defaults
• Hide env variable

Debug Output

No response