Add //> using jvm "…" directive

[alexarchambault]

Is your feature request related to a problem? Please describe.
Users can ask for a custom JVM on the command line, like scala-cli --jvm 11 foo.sc. Yet there's no corresponding using directive.

Describe the solution you'd like
Directives such as these should be accepted by Scala CLI:

//> using jvm "11"
//> using jvm "graalvm-java17:22.2.0"

[alexarchambault]

Should be a matter of setting jvmIdOpt in the BuildOptions provided by the directive.

[lwronski]

Fixed by #1539.