[typescript-axios] Fix model property naming

Created by: aiven-hh

The property names in typescript-axios models were using formatted names instead of baseName and the template has no mapping to original baseName so this PR introduces a fix by:

• removing MODEL_PROPERTY_NAMING option from typescript-axios generator as this was never supported
• using baseName in model properties wrapped with '' for now to support at least all characters except '

This should fix https://github.com/OpenAPITools/openapi-generator/issues/9524.

Also adds fake petstore example to be able verify these changes at least by eye, see samples/client/petstore/typescript-axios/builds/test-petstore/api.ts and SpecialModelName interface as an example.

In addition adds typing for options that was typed as any before.

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