feat: Add option to generate all available schemas

[KasimAhmic]

I often run into situations where my server will emit objects over WebSocket but not via any HTTP endpoint. I can add said objects to my OpenAPI schema just fine, but RTK codegen only exports the types that are referenced in endpoint definitions. This PR fixes that by allowing the developer to opt-in to exporting all available schemas from the OpenAPI spec.

Any comments are appreciated!

Closes #5010

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[KasimAhmic]

Looks like the "are-the-types-wrong" check is failing, something about reading a filename property of undefined. Not sure I can do anything about that one myself.

[aryaemami59]

Looks like the "are-the-types-wrong" check is failing, something about reading a filename property of undefined. Not sure I can do anything about that one myself.

This is related to arethetypeswrong/arethetypeswrong.github.io#258 and 101arrowz/fflate#258. It was recently resolved by arethetypeswrong/arethetypeswrong.github.io#261, and the fix was released in @arethetypeswrong/core@0.18.3. I'll put up a PR to update it shortly.