Throttle block acceptance on specified conditions

[goshawk-3]

fixes #1331

[codecov-commenter]

Codecov Report

Merging #1333 (1edff3c) into master (828364b) will decrease coverage by 8.92%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1333      +/-   ##
==========================================
- Coverage   50.51%   41.59%   -8.93%     
==========================================
  Files         145      144       -1     
  Lines        7544     9216    +1672     
==========================================
+ Hits         3811     3833      +22     
- Misses       3066     4796    +1730     
+ Partials      667      587      -80     

Impacted Files	Coverage Δ
pkg/core/consensus/testing/node.go	0.00% <0.00%> (-93.55%)	⬇️
...ore/consensus/blockgenerator/candidate/testutil.go	0.00% <0.00%> (-90.91%)	⬇️
pkg/core/consensus/testing/utils.go	0.00% <0.00%> (-75.61%)	⬇️
...core/consensus/blockgenerator/candidate/genesis.go	0.00% <0.00%> (-69.24%)	⬇️
...nsensus/blockgenerator/candidate/blockgenerator.go	0.00% <0.00%> (-64.29%)	⬇️
pkg/gql/query/transactions.go	12.60% <0.00%> (-53.38%)	⬇️
pkg/rpc/client/session.go	21.42% <0.00%> (-47.15%)	⬇️
pkg/util/nativeutils/eventbus/eventbus.go	57.14% <0.00%> (-42.86%)	⬇️
pkg/rpc/client/client.go	3.73% <0.00%> (-36.61%)	⬇️
pkg/core/consensus/reduction/aggregator.go	56.25% <0.00%> (-35.06%)	⬇️
... and 165 more

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[herr-seppia]

LGTM