Eval: Feature/heartbeats

[jannotti]

The PR to put heartbeats into main. The new heartbeats/README.md is the best place to look for explaining it.

[codecov]

Codecov Report

Attention: Patch coverage is 68.10345% with 148 lines in your changes missing coverage. Please review.

Project coverage is 52.00%. Comparing base (b7b3e5e) to head (9a5386d).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
daemon/algod/api/client/restClient.go	0.00%	28 Missing ⚠️
ledger/eval/eval.go	73.73%	17 Missing and 9 partials ⚠️
crypto/onetimesig.go	0.00%	20 Missing ⚠️
libgoal/libgoal.go	0.00%	16 Missing ⚠️
heartbeat/service.go	85.33%	6 Missing and 5 partials ⚠️
cmd/loadgenerator/main.go	0.00%	6 Missing ⚠️
ledger/apply/heartbeat.go	82.85%	3 Missing and 3 partials ⚠️
data/transactions/logic/assembler.go	0.00%	5 Missing ⚠️
ledger/ledgercore/accountdata.go	0.00%	5 Missing ⚠️
data/transactions/transaction.go	85.71%	4 Missing ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6189      +/-   ##
==========================================
+ Coverage   51.88%   52.00%   +0.11%     
==========================================
  Files         639      642       +3     
  Lines       85489    85834     +345     
==========================================
+ Hits        44359    44635     +276     
- Misses      38320    38362      +42     
- Partials     2810     2837      +27     

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