feat(vite): support adding plugin config via env var

[TooTallNate]

Extra Vite plugin configuration may be supplied by importing the file specified by the REMIX_VITE_EXTRA_CONFIG env var. This allows for additional configuration values to be specified at build-time without modifying the vite.config file.

[changeset-bot]

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Latest commit: 8fbc842

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[markdalgleish]

Thanks for the PR!

Just closing this based on our offline discussion. We're opting to support this use case via an adapter API instead: #8514