Trace local variable read/write via Truffle instrumentation

[JaroslavTulach]

Pull Request Description

• adds support for ReadVariableTag and WriteVariableTag to Enso
  • to be on par with instrumentation capabilities of Graal.js
• cfd9abf shows what kind of instrumentation is available in JavaScript
• 7665a43 expands the test also to Enso
• provide the same instrumentation for Enso
  • 647592e provides these tags,
  • 036474b exposes proper variable names
  • ffc63fb adds tracking of argument names assignments
• then 9108e77 makes it all work with existing tests
• may help with Improve visualizations feedback via cache observables and safepoints #10525
• would work great with GraalVM Insight once enhanced by Enhancing Insight to allow tracking of reads/writes of local variables oracle/graal#12760

Checklist

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

• All code follows the
  Java,
• Unit tests have been written where possible.
• engine benchmark run is fine
• standard libs benchmark run is fine

[JaroslavTulach]

• this test for example shows that since the assignment of variable r starts (with writeVariableNameEnter r message)
  • we need to read variable b (with value 15)
  • and read variable a (with value 7)
• to finish the assignment and place value 8 to the slot of variable r
• would this be useful for tracking reactive dependencies between local variables, @hubertp?

[Akirathan]

Seems useful. Minor suggestion to add docs for assignmentBounds.