feat: Extend useEnums to all schema files

[sschw]

Problem

The useEnum flag currently only generates the enums for the types defined in the schemas section of the OpenApi file.

If you define an enum directly in the parameter section, string literals are still used to define the type.

Solution

Using the same logic from the schema enum generator, the enums can also be generated for responses, requestBodies and parameters.

Limitation

This only covers the enums generated for the types generated by generateSchemaTypes. The components file will still generate string literals for parameters. This can be seen for the tests with colorParam in generatingReactQueryComponents.test.ts.