Add prettier/eslint-like "consistent" option for quoteProps

[jakebailey]

In TS, we have enabled the eslint rule that says "try not to use quotes, but if one prop needs quotes, quote all of them". prettier also has this setting; it'd be great if dprint also had this variant so we could remove a lint rule when we switch over.

• https://eslint.org/docs/latest/rules/quote-props#consistent-as-needed
• https://prettier.io/docs/en/options.html#quote-props

Note that "consistent" in both do different things; consistent-as-needed is the right one.