Added feature to set schema mappings when generation clients.

[denvitaharen]

When we tried to migrate from specifying our own openapi generator in Maven to Quarkus OpenAPI generator we realized that we missed the possibility two specify schema mappings: https://openapi-generator.tech/docs/customization/#schema-mapping

Its possible to specify that in the OpenAPI generator, so it was just to expose it so you can set it in the application.properties.

Updated the type mapping test and updated the documentation, hopefully I did all I supposed to do, this is my first attempt to help in an public repo :)

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[denvitaharen]

Strange that the build failed, it (as usual) worked when I tried it with mvn clean install, I'm looking in to why it doesn't work.

[hbelmiro]

@denvitaharen take a look at https://github.com/quarkiverse/quarkus-openapi-generator/blob/main/CONTRIBUTING.md#resteasy-reactive-and-resteasy-classic for testing RESTEasy Reactive locally.

[denvitaharen]

Sorry, my bad! I didn't noticed the different profiles, probably to tired to understand :)

I have updated the test, rerun the test suite and it works now.

[denvitaharen]

I updated the definition of YearMonth in the OpenAPI yaml. It was incorrect, it represented an LocalDateTime instead of an YearMonth. It doesn't change anything in the functionality, it's more about having a correct OpenAPI specification.

Thanks to my colleague @sajox that saw the error.

[ricardozanini]

Suggested change

	If you have an object you want to map to an datatype, you can use the schema mappings. For instance, if your schema is based
	on `java.Time.YearMonth`, it will be mapped to an string when generating. If you want to convert the object `YearMonth`then
	you can use the following settings:
	If you have an object you want to map to a datatype, you can use the schema mappings. For instance, if your schema is based on `java.Time.YearMonth`, it will be mapped to a string when generating. If you want to convert the object `YearMonth,` then you can use the following settings:

Can you please rephrase this paragraph? I'm not sure if I understood what you meant here.

[denvitaharen]

Thanks for the feedback and I understand what you mean, I also had problems understanding want I meant. I tried to rephrase the paragraph but I was never happy about it, but when I read the whole section one more time, I felt that it was enough with an example and description on how to use it (in the table) and then an link to the documentation on OpenAPI page instead.

It felt more right and easier to understand.

If you feel that this is not the way to go then I will happily try to write an new text :)