Ed Sanders authored May 14, 2024 and Esanders committed May 16, 2024

* Conceptually separate global options from "rules".
* Rules can be configured with 'off'/'error'/'warn'
  and additional options, as in ESLint.
* Convert some old options to additional rule options:
  - ignoreMissingBlankTranslations is now an option
    of requireCompleteTranslationLanguages
  - skipIncompleteMessageDocumentation is now an option
    of requireCompleteMessageDocumentation
* Convert allow* options to negative rules, so they can
  use the 'off'/'warn'/'error' system
  - allowLeadingWhitespace => disallow...
  - allowTrailingWhitespace => disallow...
* Create separate rules for leading/trailing whitespace
  in translated messages so they can be given different
  severity:
  - disallowLeadingWhitespaceTranslated
  - disallowTrailingWhitespaceTranslated
* Create a separate autofix for translated messages.

The test suite is unmodified to demonstrate that all
the legacy config values are supported.

Bug: T364843