[r4r]Introduce Casper FFG based Fast finality onto BSC (#255)

* [WIP]Fast Finality: reward distribution and slash parts (#8)

* Update codes

* Fix review comments and update test

* Fix code errors related contract SystemReward and BSCValidatorSet

* Fix code errors related invalid opcode and add new api

* Optimize gasused of updateValidator and update test

* Minor error fixed

* Fix review comments and update scripts

* Fix init issue

* Fix external view issue and update test

* Fix review comments

* Update for new fast finality rules and related issues

* Revert code format changes

* Resolve conflict

* Update contracts' abi

* Update finality reward related events

* Fix some audit comments

* resolve conflict and adapt to new precompile bls verify contract

* fix: recover deleted verifyBLSSignature function call

* fix: revert modification for local unit test

* fix: errors with template

* fix rebase errors

* update contract abi

* update finality reward distribution logic

* update reward calculation using SafeMath lib

---------

Co-authored-by: Roshan <48975233+loverush@users.noreply.github.com>

BLSkeystore.json

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+}