add the ability to read more environmet information. (list of compiler plugins, target JVM version)

[rssh]

Motivation - let us have a macro with functionality, which have sense only if an appropriative compiler plugin is enabled.
Examples of use cases:

• async macro can call direct-style methods marked by context parameters only if the appropriate compiler plugin is in the same run.
• async macro can use the loom subsystem for transforming HO. method if target JVM is >= 21
• macro can generate places for inserting instrumentation calls by instrumentation plugin if one is enabled.

[ahoy-jon]

Interested too. I am currently writing a macro that would only make sense is Capture Checking is activated.