AVM: incentive opcodes

[jannotti]

Adds AVM access to things that make sense for smart contracts related to block incentives.

[jasonpaulos]

Separate topic: do we want to make a new REST endpoint for voting account data? It seems a bit odd that there's a reason to expose this stuff for on-chain contracts which wouldn't also apply to off-chain users as well.

[codecov]

Codecov Report

Attention: Patch coverage is 33.10811% with 99 lines in your changes are missing coverage. Please review.

Project coverage is 56.11%. Comparing base (b259709) to head (9743a9f).
Report is 17 commits behind head on master.

Files	Patch %	Lines
ledger/eval/eval.go	3.44%	28 Missing ⚠️
cmd/tealdbg/localLedger.go	0.00%	18 Missing ⚠️
daemon/algod/api/server/v2/dryrun.go	0.00%	18 Missing ⚠️
data/transactions/logic/eval.go	68.42%	8 Missing and 4 partials ⚠️
ledger/eval/applications.go	0.00%	9 Missing ⚠️
data/transactions/logic/fields.go	72.72%	5 Missing and 1 partial ⚠️
ledger/tracker.go	0.00%	4 Missing ⚠️
data/transactions/logic/fields_string.go	50.00%	1 Missing and 1 partial ⚠️
ledger/eval/cow.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5984      +/-   ##
==========================================
- Coverage   56.13%   56.11%   -0.02%     
==========================================
  Files         482      481       -1     
  Lines       68027    68074      +47     
==========================================
+ Hits        38187    38203      +16     
- Misses      27243    27273      +30     
- Partials     2597     2598       +1     

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[jannotti]

Separate topic: do we want to make a new REST endpoint for voting account data? It seems a bit odd that there's a reason to expose this stuff for on-chain contracts which wouldn't also apply to off-chain users as well.

I guess so, because it's strange. On the other hand, I don't know if it's all that useful. I feel like we're adding these opcodes to fill a potential hole in the ability to make correct contracts that can do almost anything the in protocol incentive scheme can do. If you're off-chain, you have a lot of extra flexibility - For example you can record and use the old (balance round) information.

[jasonpaulos]

I guess so, because it's strange. On the other hand, I don't know if it's all that useful. I feel like we're adding these opcodes to fill a potential hole in the ability to make correct contracts that can do almost anything the in protocol incentive scheme can do. If you're off-chain, you have a lot of extra flexibility - For example you can record and use the old (balance round) information.

Ok, that's convincing enough for now. At the very least, I don't think expanding the REST API should happen in this PR.

[pbennett]

Things I need for Reti at the moment (looks like 2 of the 4-5 are covered here)
✅ Current online stake
✅ Whether an account is incentive eligible (so I can know if extra fee is needed when going online)
❌ The 'fee' required when going online to make the account IncetiveEligible.
❌ The maximum algo amount for incentives
❌ The minimum amount for incentives would be nice as well (but not 'needed')

[jannotti]

#5998