Inline codegen

[magik6k]

The general idea is that we can use some magic template comments + shared json to add codegen to any part of the code.

TODO:

• Decide if we want this
• Maybe figure out a nicer comment format
• Add to some more places
• Attach to make gen
• Fix lint

To use right now, run go run ./gen/inline-gen . gen/inlinegen-data.json; go fmt ./...

[arajasek]

I think we want this!

[codecov]

Codecov Report

Merging #7495 (1d8a9c7) into master (67bdc26) will decrease coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #7495      +/-   ##
==========================================
- Coverage   39.88%   39.70%   -0.19%     
==========================================
  Files         631      631              
  Lines       66907    66924      +17     
==========================================
- Hits        26688    26574     -114     
- Misses      35614    35746     +132     
+ Partials     4605     4604       -1     

Impacted Files	Coverage Δ
build/params_shared_vals.go	71.42% <ø> (ø)
chain/actors/version.go	87.50% <ø> (ø)
chain/vm/mkactor.go	50.00% <ø> (ø)
chain/consensus/filcns/compute_state.go	74.11% <100.00%> (+0.78%)	⬆️
chain/state/statetree.go	67.55% <100.00%> (+0.09%)	⬆️
itests/kit/ensemble_opts_nv.go	100.00% <100.00%> (ø)
chain/actors/builtin/paych/v5.go	0.00% <0.00%> (-40.00%)	⬇️
chain/actors/builtin/paych/message5.go	0.00% <0.00%> (-28.89%)	⬇️
extern/sector-storage/sched_resources.go	73.52% <0.00%> (-11.77%)	⬇️
chain/actors/builtin/miner/diff.go	48.52% <0.00%> (-10.30%)	⬇️
... and 25 more

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[arajasek]

niiiice