Fix tests, build, and support Id.MINIMAL_CLASS, and Id.SIMPLE_NAME

[Nthalk]

I have been using this library for years, and I use Tagged Unions extensively.
I have some situations where I have many sub-classes, and I would like to make writing code as compact and concise as possible.

Jackson supports different kinds of use=Id variants, however, only NAME, and CLASS are supported.

I originally tried to get MINIMAL_CLASS, and Jacksin 2.18's SIMPLE_NAME to work, however, I had problems with running the existing tests and building due to immutables not being on the compilation annotation path, and the fact that Java12+ isn't supported.

Fixed the immutables error by adding the annotation to the compilation path (this shouldn't affect the end jar).
Made building the project more error-obvious by introducing MavenEnforcer to demand it be built with Java 11.

Now that building and testing is easier, a Kotlin test is introduced (to allow testing for sealed things, as we are not building in Java17+ yet).

This allows us to write more minimal effort definitions like:

@JsonTypeInfo(use = JsonTypeInfo.Id.MINIMAL_CLASS)
    sealed interface MinimalEffort {
        data class A(
            val a: String
        ) : MinimalEffort

        data object B : MinimalEffort
    }

And if we are using Jackson 2.18+, we can use Id.SIMPLE_NAME as well.

It does this by, instead of detecting supported Id types, it detects non-compatible Id types, like CUSTOM, NONE, and DEDUCTION, which is a more forward compatible method.

Without this, one would need to annotate every class with @JsonTypeName(...) in the case of Id.NAME, or be stuck with the full class: Id.CLASS.

[Nthalk]

Is there any way to retry the checks? It got a 502 on the github http call.