Chisel type prints need improvement

[ducky64]

Printing Chisel types gives fun and useless strings like UInt@4fd5e7a. But the FIRRTL emitter can make coherent types, though that functionality isn't directly accessible from Data subtypes. What would be nice is for Data subtypes to override toString with:

• as a chisel type: print the FIRRTL type, or something close to it, eg UInt<8>
• as a bound object: also indicate the binding and parent module, ideally also add basic source locator information, eg UInt<8>(Reg in MyModule @ MyModule.scala:104)
• as a literal: indicate the type and value, eg UInt<8>(233)

Bikeshedding on the precise representation is welcome.

Type of issue: feature request, other enhancement

Impact: no functional change

Development Phase: request, proposal