Hookup demand-driven forward mode to the Diffractor runtime

[Keno]

Tests currently depend on JuliaLang/julia#48045 and JuliaLang/julia#48059, so we should either get those merged first, or mark them here as broken.

[codecov-commenter]

Codecov Report

Base: 52.68% // Head: 51.34% // Decreases project coverage by -1.34% ⚠️

Coverage data is based on head (064fc72) compared to base (88bc4c2).
Patch coverage: 64.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   52.68%   51.34%   -1.35%     
==========================================
  Files          27       27              
  Lines        2513     2604      +91     
==========================================
+ Hits         1324     1337      +13     
- Misses       1189     1267      +78     

Impacted Files	Coverage Δ
src/higher_fwd_rules.jl	50.00% <0.00%> (-18.75%)	⬇️
src/stage2/lattice.jl	20.00% <0.00%> (-2.23%)	⬇️
src/codegen/forward_demand.jl	30.17% <62.96%> (-26.85%)	⬇️
src/stage2/interpreter.jl	21.36% <63.63%> (+8.36%)	⬆️
src/stage2/forward.jl	96.66% <94.44%> (-3.34%)	⬇️
src/stage1/forward.jl	71.91% <100.00%> (ø)
src/stage1/generated.jl	72.48% <0.00%> (-0.44%)	⬇️

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