Added parameter to set the block gas limit

[mrsmkl]

Description

Added the parameter to the BlockchainParameters contract

Tested

Just added unit test for now.

Other changes

Related issues

• Fixes Protocol SBAT set block gas limit via governance  celo-blockchain#474 (partially, I'll add the corresponding PR there once the blocking PR is merged)

Backwards compatibility

Brief explanation of why these changes are/are not backwards compatible.

[m-chrzan]

Looks good!

[codecov]

Codecov Report

Merging #1245 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #1245     +/-   ##
=========================================
- Coverage   74.24%   74.15%   -0.1%     
=========================================
  Files         287      287             
  Lines        7703     7652     -51     
  Branches      666      960    +294     
=========================================
- Hits         5719     5674     -45     
+ Misses       1871     1865      -6     
  Partials      113      113

Flag	Coverage Δ
#mobile	74.15% <ø> (-0.1%)	⬇️

Impacted Files	Coverage Δ
packages/mobile/src/web3/contracts.ts	53.06% <0%> (-0.14%)	⬇️
...es/mobile/src/verify/VerificationLoadingScreen.tsx	100% <0%> (ø)	⬆️
.../mobile/src/verify/VerificationEducationScreen.tsx	88.23% <0%> (ø)	⬆️
packages/mobile/src/invite/utils.ts	100% <0%> (ø)	⬆️
packages/mobile/src/components/Carousel.tsx	88.88% <0%> (ø)	⬆️
.../mobile/src/verify/VerificationLearnMoreScreen.tsx	100% <0%> (ø)	⬆️
...bile/src/verify/VerificationInterstitialScreen.tsx	100% <0%> (+9.52%)	⬆️
...ages/mobile/src/verify/VerificationInputScreen.tsx	100% <0%> (+10.2%)	⬆️

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[asaj]

🔥