Using `Channel` to load Java classes

[JaroslavTulach]

Pull Request Description

• Provides an opt-in implementation to load classes via HotSpot JVM even when running in native image mode
• Use --vm.D=polyglot.enso.classLoading option - more detail to turn the mode on
• 53b24903e5cc69c9becd62a98c8a441e51619f95 creates new jvm-channel module with less dependencies than os-environment has
  • just a refactoring of code introduced by #13206
• f0cff3dc9572d01534e0efd66a004340d9c16b1f creates a unit test using Channel in a single JVM
• Use Channel in jvm-interop project to implement InteropLibrary messages: 9c129de
• connect EnsoContext and jvm-interop in e41d046
• use the jvm-interop to start HotSpot JVM and load a class if it is not in native image

Pros

• the system for interacting with HotSpot JVM is ready
• it can execute some Generic_JDBC_Tests

Pending Future Features

• logging in the HotSpot JVM isn't configured
• there is no GC support - what's allocated stays allocated

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• [x] All code follows the Scala, Java,
• [x] Unit tests have been written where possible.

[github-actions[bot]]

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[JaroslavTulach]

With 4f373cd we can run some of the Generic_JDBC_Tests in the dual JVM mode:

$ ENSO_LAUNCHER=native,-ls,fast sbt
sbt:enso> runEngineDistribution --run test/Generic_JDBC_Tests
11 tests succeeded.
11 tests failed.
0 tests skipped.
0 groups skipped.

[JaroslavTulach]

I've turned the whole infrastructure into an opt-in feature. I'd like to integrate now. Please review the PR.