AVM: Assembly simplification & flexible costs

[jannotti]

Removes the need for writing many assembly routines, and adds flexibility to opcode cost model.

[codecov-commenter]

Codecov Report

Merging #3857 (d9f1480) into master (70a5532) will decrease coverage by 0.01%.
The diff coverage is 79.03%.

@@            Coverage Diff             @@
##           master    #3857      +/-   ##
==========================================
- Coverage   50.00%   49.98%   -0.02%     
==========================================
  Files         393      393              
  Lines       68353    68200     -153     
==========================================
- Hits        34178    34090      -88     
+ Misses      30450    30404      -46     
+ Partials     3725     3706      -19     

Impacted Files	Coverage Δ
data/transactions/logic/opcodes.go	81.73% <60.86%> (-15.33%)	⬇️
data/transactions/logic/eval.go	89.80% <72.50%> (+0.08%)	⬆️
data/transactions/logic/assembler.go	82.36% <84.61%> (+1.03%)	⬆️
data/transactions/logic/doc.go	57.69% <100.00%> (+12.23%)	⬆️
data/transactions/logic/fields.go	76.25% <100.00%> (+29.44%)	⬆️
ledger/blockqueue.go	82.18% <0.00%> (-2.88%)	⬇️
ledger/tracker.go	74.67% <0.00%> (-2.15%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
data/transactions/verify/txn.go	44.15% <0.00%> (-0.87%)	⬇️
ledger/acctupdates.go	68.51% <0.00%> (-0.66%)	⬇️
... and 4 more

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[gmalouf]

I went through everything (thanks JJ for answering questions live) - leaving final approval to folks closer to the AVM. Highly supportive of the consolidation around how costs are handled; it is much easier to follow having them calculated/displayed off of a common type with the inputs gathered together.

[michaeldiamant]

@jannotti Thanks for the effort here to enrich the cost model while also simplifying assembly. ☕

[algorandskiy]

acct_params_get is missing fields and types in langspec.json file

[jannotti]

#3862 adds them