Cover Bor Filters with testcases

[0xsharma]

The PR contains the following changes :

• Workaround to create state-sync tx manually for testcases.
• Func TestBorFilters() : test filters for bor-transactions.
• Some miner changes with sprint size. Sprint size will be determined from the genesis where as it was hardcoded to 64 before.

Link to Jira Task.

[codecov-commenter]

Codecov Report

Merging #456 (9aad8bf) into develop (c446937) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #456      +/-   ##
===========================================
- Coverage    56.30%   56.23%   -0.07%     
===========================================
  Files          603      600       -3     
  Lines        69529    69506      -23     
===========================================
- Hits         39149    39090      -59     
- Misses       27012    27032      +20     
- Partials      3368     3384      +16     

Impacted Files	Coverage Δ
params/config.go	32.12% <ø> (ø)
eth/filters/bor_filter.go	66.66% <100.00%> (+66.66%)	⬆️
accounts/keystore/watch.go	90.69% <0.00%> (-9.31%)	⬇️
node/defaults.go	24.13% <0.00%> (-6.90%)	⬇️
rpc/server.go	72.50% <0.00%> (-5.00%)	⬇️
p2p/discover/table.go	82.48% <0.00%> (-3.65%)	⬇️
les/distributor.go	79.68% <0.00%> (-3.13%)	⬇️
p2p/enode/iter.go	88.34% <0.00%> (-2.92%)	⬇️
p2p/discover/v4_udp.go	72.75% <0.00%> (-2.90%)	⬇️
core/rawdb/chain_iterator.go	58.38% <0.00%> (-2.49%)	⬇️
... and 28 more

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[JekaMas]

@0xsharma Could you fix the CI?