Add quality duration multiplier

[Kubuxu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 68.84%. Comparing base (d4f3a0c) to head (4d2d802).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
gpbft/options.go	62.50%	2 Missing and 1 partial ⚠️
manifest/manifest.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #805      +/-   ##
==========================================
- Coverage   69.38%   68.84%   -0.55%     
==========================================
  Files          78       81       +3     
  Lines        7957     8255     +298     
==========================================
+ Hits         5521     5683     +162     
- Misses       1971     2087     +116     
- Partials      465      485      +20     

Files with missing lines	Coverage Δ
gpbft/gpbft.go	89.14% <100.00%> (+0.02%)	⬆️
gpbft/options.go	58.22% <62.50%> (+0.48%)	⬆️
manifest/manifest.go	53.04% <25.00%> (-0.71%)	⬇️

... and 7 files with indirect coverage changes

[masih]

Comment on terminology, otherwise LGTM.

[masih]

QualityDeltaMultiplier and rename across the code?

The rationale being: the duration of quality is not exactly governed by that multiplier. It will finish on strong quorum of proposal. Calling it a Delta multiplier is clearer because it is that.