go/worker/storage: Add configurable limits for storage operations

[kostko]

Fixes #1914

[codecov]

Codecov Report

Merging #2618 into master will decrease coverage by 0.19%.
The diff coverage is 42.16%.

@@           Coverage Diff            @@
##           master   #2618     +/-   ##
========================================
- Coverage    63.2%     63%   -0.2%     
========================================
  Files         360     360             
  Lines       33972   34046     +74     
========================================
- Hits        21471   21451     -20     
- Misses       9859    9923     +64     
- Partials     2642    2672     +30

Impacted Files	Coverage Δ
go/worker/storage/worker.go	74.26% <ø> (ø)	⬆️
go/registry/api/runtime.go	37.5% <ø> (ø)	⬆️
go/storage/api/api.go	73.91% <ø> (ø)	⬆️
go/registry/api/api.go	36.7% <0%> (-1.2%)	⬇️
go/oasis-test-runner/oasis/runtime.go	0% <0%> (ø)	⬆️
go/oasis-node/cmd/registry/runtime/runtime.go	57.87% <100%> (+1.39%)	⬆️
go/registry/tests/tester.go	90.17% <100%> (+0.07%)	⬆️
go/worker/storage/service_external.go	40.44% <29.41%> (-17.74%)	⬇️
go/storage/mkvs/urkel/writelog/iterator.go	76.36% <0%> (-16.37%)	⬇️
... and 17 more

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[Yawning]

Errr, don't these need to be consensus backed?

[kostko]

Errr, don't these need to be consensus backed?

Hm, good point, once we have storage availability probes they should probably take these into account. I'll move them over to the runtime's storage config.

[kostko]

Changed to consensus parameters.