add support for JDK toolchains

### New feature, improvement proposal

Maven Archiver defines `META-INF/MANIFEST.MF` entries:
- `Build-Jdk-Spec`
- `Build-Jdk`

they are taken from Maven runtime: when a JDK toochain is used, we need clarity between JDK/JRE running Maven (the build tool) vs JDK for compiling (running the compiler)

`Build-Jdk`and `Build-Jdk-Spec` in spirit are more about he compiler than Maven runtime

`Build-Tool-Jdk-Spec` (or `Jre`?) should give the Java version used by Maven build tool runtime, at least when toolchains is used, perhaps also when toolchains are not used, just to start giving good habits of not always considering they are the same
And perhaps do the equivalent for `Build-Tool-Jdk`

### Existing solution in Maven Jar Plugin

this has been partially done in Maven Jar Plugin 3.4.0 MJAR-62:
- adding `Build-Tool-Jdk-Spec` with runtime value = https://github.com/apache/maven-jar-plugin/pull/73,
- overriding `Build-Jdk-Spec` with the value from the toolchain
- disabling default manifest entries (which disables `Java-Version` added in #298)
- ignoring `Build-Jdk`: in case of toolchains usage, `Build-Jdk` gives full java version from Maven runtime, while `Build-Jdk-Spec` gives spec of toolchain

this algorithm would be better implemented in Maven Archiver, with the plugin just configuring the toolchain to Maven Archiver: then Maven Archiver can use the toolchain

this would probably also be a good first step to injecting later the toolchain to Plexus Module Archiver that seems to be necessary given failure described in https://github.com/apache/maven-jar-plugin/issues/439

Start by reading Maven Archiver's manifest-entry handling and the Maven Jar Plugin 3.4.0 implementation from MJAR-62, including pull request 73. Compare how toolchain and Maven runtime versions are selected. Done means Maven Archiver can receive and use the toolchain while distinguishing compiler JDK entries from build-tool JDK entries, with the relevant behavior covered by tests.

Written by the indexing model from the issue text.