Ability to set a min language version for a toolchain (maybe also max and preferred)

[Vampire]

I have a library where I still maintain Java 8 compatibility.
But I want JavaDoc to always be created with at least Java 9 to get the nice search box.
So I could configure a Java 9 toolchain for the JavaDoc task of course.
But if someone builds with Java 11, there is not really a need to discover or auto-provision a Java 9 toolchain.
Because of that it would be nice if you could specify a toolchain with min language version (maybe there are also use-cases for max language version), so that the current toolchain is used if it is recent enough and just another one is searched if it is too old.

Currently you would probably have to do something like

tasks.javadoc {
    if (!JavaVersion.current().isJava9Compatible) {
        javadocTool.set(javaToolchains.javadocToolFor {
            languageVersion.set(JavaLanguageVersion.of(9))
        })
    }
}

[Vampire]

While the work-around of course only works if the current version is compatible, a min version and max version would be better as then also another discovered version can be used, like you specify "min java 9", run with java 8, and there is a discovered java 10, then for the JavaDoc task the discovered version can be used without provisioning a new java 9 version.

Maybe even a "preferred version" would make sense then, so if min version is 9 and 9 and 10 is discovered that the preferred one is used, but that might be overkill.

[stale]

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[JojOatXGME]

When you specify Java 17 as the minimum version, I guess Gradle should implicitly specify -release 17 when it uses a more recent JDK for compiling.