feat(debounce): add debounce to connection message in background

[sk91]

Allows to debounce posting messages to connection in background

[codecov-io]

Codecov Report

Merging #12 into master will decrease coverage by 6.89%.
The diff coverage is 66.66%.

@@           Coverage Diff            @@
##           master     #12     +/-   ##
========================================
- Coverage     100%   93.1%   -6.9%     
========================================
  Files           3       4      +1     
  Lines          47      58     +11     
========================================
+ Hits           47      54      +7     
- Misses          0       4      +4

Impacted Files	Coverage Δ
src/background-store.js	100% <100%> (ø)	⬆️
src/utils.js	20% <20%> (ø)

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