Keep casing for schema types exported to root

[gunnarvelle]

Changes

#2402
Adds flag to keep casing of the schema types exported at the root of the generated typescript.

How to Review

The test options > rootTypes: true but keep casing shows the effect of the change

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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Latest commit: 37d070b

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