governance: APIs override deprecated parameters

[blukat29]

Proposed changes

kaia_getParams, governance_getParams, kaia_getChainConfig, governance_getChainConfig APIs to override deprecated parameters depending on hardfork level. Namely,

• since Kore, reward.useginicoeff is false as All committee members have an equal chance of being elected block proposers Remove weight and gini coefficient during proposer selection klaytn/klaytn#1655
• since Randao, reward.proposerupdateinterval is 1 as proposer list is no longer used, rather proposers are selected every block at random. (kip-146: Random proposer selection based on RANDAO klaytn/klaytn#2030)
• since Kaia, reward.stakingupdateinterval is 1 as staking information is updated every block, effectively deprecating the interval. (Update validator refresh interval klaytn/klaytn#2154)

Though these fields could be deleted later as in #91, we first return the close-to-reality values to avoid confusion.

Types of changes

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• Bugfix
• New feature or enhancement
• Others

Checklist

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• Lint and unit tests pass locally with my changes ($ make test)
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Related issues

Further comments

Example

• kaia_getParams, governance_getParams

   > kaia.getParams(0)
   {
     // ...
     reward.proposerupdateinterval: 3600,
     reward.ratio: "34/54/12",
     reward.stakingupdateinterval: 86400,
     reward.useginicoeff: true
   }

   > kaia.getParams("latest")
   {
     // ...
     reward.proposerupdateinterval: 1,
     reward.ratio: "50/25/25",
     reward.stakingupdateinterval: 1,
     reward.useginicoeff: false
   }

• kaia_getChainConfig, governance_getChainConfig

   > kaia.getChainConfig(0)
   {
     // ...
        reward: {
         deferredTxFee: true,
         kip82ratio: "20/80",
         minimumStake: 5000000,
         mintingAmount: 9600000000000000000,
         proposerUpdateInterval: 3600,
         ratio: "34/54/12",
         stakingUpdateInterval: 86400,
         useGiniCoeff: true
       }
     // ...
   }

   > kaia.getChainConfig("latest")
   {
     // ...
       reward: {
         deferredTxFee: true,
         kip82ratio: "20/80",
         minimumStake: 5000000,
         mintingAmount: 9600000000000000000,
         proposerUpdateInterval: 1,
         ratio: "50/25/25",
         stakingUpdateInterval: 1,
         useGiniCoeff: false
       }
     },
     // ...
   }