feat(openai-compatible): emit warning when using kebab-case instead of camelCase

[aayush-kapoor]

Background

there was a TODO introduced in #11838 that talked about deprecating any providerOptions use that are defined with a kebab-case key.

for user facing APIs we should use camelCase. we should deprecate and eventually remove all other provider options

Summary

• new warning type: deprecated added that will allow us to use/emit a similar warning for other providers
• introduced a new helper function warnIfDeprecatedProviderOptionsKey that will emit the warnings
• the change is still backwards compatible: kebab-case providerOptions will still work

Manual Verification

verified by running the example examples/ai-functions/src/generate-text/openai/compatible-chat-provider-options.ts before and after to see if the warning was emitted

Checklist

• Tests have been added / updated (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• A patch changeset for relevant packages has been added (for bug fixes / features - run pnpm changeset in the project root)
• I have reviewed this pull request (self-review)