[FIRRTL][InferDomains] Add option to skip checking specific domains

[uenoku]

Introduce a -disable-domain command-line flag to let developers bypass
error checking for specific hardware domains (like PowerDomain).

This is necessary because it was impossible to cleanly develop or debug
an individual domain on its own. Unfinished domains would throw a flood
of validation errors and block the compiler, preventing developers from
testing the specific parts they were actively working on. This flag lets
you temporarily silence those incomplete domains.

[uenoku]

Alternative approach might be to strip specific domains as a prepass instead of suppressing individual errors, but wasn't clear which approach was better.