test: add tests for block filter protocol

[codecov-commenter]

Codecov Report

Merging #51 (16cfb27) into develop (2719071) will increase coverage by 6.26%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop      #51      +/-   ##
===========================================
+ Coverage    26.84%   33.10%   +6.26%     
===========================================
  Files           22       22              
  Lines         3338     3338              
  Branches       462      462              
===========================================
+ Hits           896     1105     +209     
+ Misses        2353     2120     -233     
- Partials        89      113      +24     

Flag	Coverage Δ
unittests	33.10% <100.00%> (+6.26%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/protocols/filter/block_filter.rs	71.42% <ø> (+54.94%)	:arrow_up:
src/protocols/mod.rs	0.00% <ø> (ø)
...otocols/filter/components/block_filters_process.rs	74.24% <100.00%> (+74.24%)	:arrow_up:
src/storage.rs	85.68% <0.00%> (+3.34%)	:arrow_up:
src/protocols/light_client/peers.rs	42.45% <0.00%> (+41.34%)	:arrow_up:
src/protocols/status.rs	70.73% <0.00%> (+53.65%)	:arrow_up:

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