feat: Compile-time reflection

[tibordp]

That's a fairly big bundle of changes I didn't bother splitting up, but basically

• Constant expression tuple indexing tup.(1 + 1)
• Static for (unrolled in mono and lowered separately for each iteration) - you can now loop over tuples!
• A much more full-featured reflection system
  • typestated Type descriptor in std::typing that has basic info (size, align, name, is_X, ...)
  • struct field descriptors (really fancy with static for - you can basically build e.g. JSON parser into a struct)
• JSON implementation of unmarshalling using reflection
• A whole bunch of refactoring
  • Ripped out most of the unit test machinery from mono - it's now just "monomorphize all items with this attribute"
  • A whole lot of cleanup / renaming / splitting
  • Remove unneeded IR node types
  • etc.

[codecov]

Codecov Report

Attention: Patch coverage is 87.82609% with 196 lines in your changes missing coverage. Please review.

Project coverage is 88.70%. Comparing base (806ddb4) to head (f990e9d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/alumina-boot/src/ir/mono/intrinsics.rs	91.41%	75 Missing ⚠️
src/alumina-boot/src/ast/pretty.rs	58.73%	26 Missing ⚠️
src/alumina-boot/src/visitors.rs	70.88%	23 Missing ⚠️
src/alumina-boot/src/ast/expressions.rs	76.05%	17 Missing ⚠️
src/alumina-boot/src/ast/macros.rs	48.00%	13 Missing ⚠️
src/alumina-boot/src/ast/rebind.rs	60.60%	13 Missing ⚠️
src/alumina-boot/src/ir/mod.rs	78.18%	12 Missing ⚠️
src/alumina-boot/src/diagnostics.rs	70.00%	9 Missing ⚠️
src/alumina-boot/src/codegen/elide_zst.rs	80.00%	3 Missing ⚠️
src/alumina-boot/src/compiler.rs	75.00%	2 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
- Coverage   88.94%   88.70%   -0.24%     
==========================================
  Files          35       34       -1     
  Lines       16565    16827     +262     
==========================================
+ Hits        14734    14927     +193     
- Misses       1831     1900      +69     

Flag	Coverage Δ
	88.70% <87.82%> (?)

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