[WIP] feat(cli): upgrade clap to v3

[crowlKats]

Closes #8475

[crowlKats]

blocked by clap-rs/clap#2233

[ry]

Thanks @crowlKats. I like that this upgrade finally gets rid of our ansi_term dependency. (Not so happy it adds clap_generate, clap_derive, heck, proc-macro-error, os_str_bytes, proc-macro-error-attr...)

Should we wait for Clap v3.0.0 to be released? Are there any public facing changes? (AFAICT it looks the same.)

Can we do this upgrade without using clap_generate?

[bartlomieju]

Thanks @crowlKats. I like that this upgrade finally gets rid of our ansi_term dependency. (Not so happy it adds clap_generate, clap_derive, heck, proc-macro-error, os_str_bytes, proc-macro-error-attr...)

Should we wait for Clap v3.0.0 to be released? Are there any public facing changes? (AFAICT it looks the same.)

I think we should, clap author explicitly state not to upgrade because of more changes being considered for 3.0.

Can we do this upgrade without using clap_generate?

Nope, it's used to generate shell-completions (for deno completions subcommand)

[bartlomieju]

Ref #8475

As per Discord conversation; we'll land this PR after stable release of Clap v3. Closing for now.