docs: mark Remote Config as Windows-supported

[nightcityblade]

Description

Updates the stable plugins table to show that Remote Config supports Windows. Also adds the contributor entry required by the Contributor Guide.

Related Issues

Fixes #18763

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide). N/A: this is a documentation-only change with no runtime behavior.
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///). This PR updates the repository README.
• The analyzer (melos run analyze) does not report any problems on my PR. N/A: no Dart source files changed.
• I read and followed the Flutter Style Guide.
• I signed the CLA. I will complete it if the CLA check requests action.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change.
• No, this is not a breaking change.

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