API to enable tracing back JIT/IR values back to DSLX structs.

For test and verification, a workflow we want to support is to convert DSLX into IR and then run vectors through the DSLX via IR JIT.

When something goes wrong, or the results are unexpected we should be able to convert specific signal value as understood by the IR (ex. a proc state, a channel receive/send value, etc...) and map it back into the original DSLX. If that signal value came from a DSLX struct originally it should be possible to map it back to individual named struct fields.

This item is to create an API such that given an IR value, the DSLX struct representation is returned (ex. as a string).

Note that this may be complicated due to optimizations between the DSLX and the final IR. For example, if the desired signal value is a state element multiple optimizations may have modified things (ex. state minimization, state tuple expansion, proc inlining, etc...)