Add integration with ILSpy's Lowering/Decompilation feature

[waf]

Add support for ILSpy's lowering/decompilation feature.

The actual feature work is not much code, given we can re-use all the same infrastructure that disassembly already has in place.

The PR seems a bit big but that's because I reorganized Disassembler.cs so I could reuse the same infrastructure for lowering. Now, a new class CodeTransformer does the compilation rather than the disassembler, and it passes this compilation information into either Disassembler or the new CodeLowerer.

[codecov]

Codecov Report

❌ Patch coverage is 91.11748% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.7%. Comparing base (45245e1) to head (6dcd55b).

Files with missing lines	Patch %	Lines
...ces/CodeTransformation/Disassembly/Disassembler.cs	88.4%	8 Missing and 4 partials ⚠️
...rmation/Lowering/ImplementationAssemblyResolver.cs	83.7%	5 Missing and 1 partial ⚠️
...ervices/CodeTransformation/Lowering/CodeLowerer.cs	92.9%	4 Missing and 1 partial ⚠️
CSharpRepl/CSharpReplPromptCallbacks.cs	81.4%	2 Missing and 3 partials ⚠️
...epl.Services/CodeTransformation/CodeTransformer.cs	97.9%	0 Missing and 2 partials ⚠️
CSharpRepl/ReadEvalPrintLoop.cs	50.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #471     +/-   ##
=======================================
+ Coverage   71.4%   71.7%   +0.3%     
=======================================
  Files         96      99      +3     
  Lines       7133    7298    +165     
  Branches    1056    1080     +24     
=======================================
+ Hits        5095    5237    +142     
- Misses      1700    1719     +19     
- Partials     338     342      +4     

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