transfer workload include burns

[ptrus]

• adds staking.Burn transactions to the transfer workload
• extracts repeated "estimateGas, fund caller, sign tx, submit tx" action into a helper function

[codecov]

Codecov Report

Merging #2773 into master will decrease coverage by 0.41%.
The diff coverage is 13.79%.

@@            Coverage Diff             @@
##           master    #2773      +/-   ##
==========================================
- Coverage   63.13%   62.71%   -0.42%     
==========================================
  Files         387      387              
  Lines       36540    36526      -14     
==========================================
- Hits        23070    22909     -161     
- Misses      10554    10748     +194     
+ Partials     2916     2869      -47     

Impacted Files	Coverage Δ
...sis-node/cmd/debug/txsource/workload/delegation.go	62.60% <0.00%> (-2.56%)	⬇️
...s-node/cmd/debug/txsource/workload/registration.go	75.93% <0.00%> (+1.49%)	⬆️
...oasis-node/cmd/debug/txsource/workload/transfer.go	0.00% <0.00%> (-63.64%)	⬇️
...oasis-node/cmd/debug/txsource/workload/workload.go	67.07% <54.05%> (-10.71%)	⬇️
go/worker/common/host/interface.go	38.46% <0.00%> (-15.39%)	⬇️
go/worker/compute/executor/committee/state.go	74.07% <0.00%> (-11.12%)	⬇️
go/storage/metrics.go	84.78% <0.00%> (-6.53%)	⬇️
go/common/grpc/auth/auth.go	88.88% <0.00%> (-5.56%)	⬇️
go/oasis-node/cmd/debug/byzantine/byzantine.go	35.01% <0.00%> (-5.04%)	⬇️
go/worker/compute/executor/committee/node.go	60.82% <0.00%> (-4.53%)	⬇️
... and 16 more

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[pro-wh]

hm, is there some other kind of description somewhere we can use better to indicate that the "transfer" workload is 50-50 transfers and burns?

[ptrus]

hm, is there some other kind of description somewhere we can use better to indicate that the "transfer" workload is 50-50 transfers and burns?

added a comment to the name constant since i couldn't come up with a workload name better indicating it