Expose common pass through commands in `--help`

[calebschoepp]

cargo component passes through certain commands like build to be run by cargo. The blurb at the bottom of --help explains this.

Unrecognized subcommands will be passed to cargo verbatim after
relevant component bindings are updated.

However, it would be helpful to document the common commands that you might want to pass through to cargo like cargo component build. This would be more clear to new users to understand how to build their component.