Reflect API changes from Kaia v1.0.1

[blukat29]

1. Message signing RPCs api: Message signing RPCs are EIP-191 compliant kaia#33
2. Gas price recommending RPCs Return zero tip cap if next baseFee is lower bound kaia#28 Update SuggestTipCap default tip cap kaia#44 api: gasPrice API returns basefee with a buffer multiple kaia#45

[blukat29]

1. Message signing RPCs

Please replace the RPC descriptions. I want the (...This prevents misuse...) paragraph removed because the EIP explains the rationale. I also want the (...Steps to test...) paragraph removed because it describes regular Ethereum API behavior which we don't have to explain.

• klay_sign, kaia_sign, eth_sign, personal_sign

  The method calculates an [EIP-191](https://eips.ethereum.org/EIPS/eip-191) signature: sign(keccak256("\x19Ethereum Signed Message:\n" + len(message) + message)))
  
  **NOTE**: In versions earlier than Kaia v1.0.1, the method calculates an [KIP-97](https://kips.kaia.io/KIPs/kip-97) signature: sign(keccak256("\x19Klaytn Signed Message:\n" + len(message) + message)))
  
  The personal_ecRecover and kaia_recoverFromMessage methods can verify the signature.
  

• personal_ecRecover
  No change
• klay_recoverFromMessage, kaia_recoverFromMessage

   This method recovers or verifies an ECDSA signature signed by a private key associated with the given address.
   
   The signature has to be signed by the private key that constitutes the account, e.g. "natural" private key of a Legacy account, one of the keys of a WeightedMultisig account.
   
   Both [EIP-191](https://eips.ethereum.org/EIPS/eip-191) and [KIP-97](https://kips.kaia.io/KIPs/kip-97) signatures are accepted.
  

• klay_signTransaction, kaia_signTransaction, klay_signTransactionAsFeePayer, kaia_signTransactionAsFeePayer, eth_signTransaction
  Remove the paragraph: ...will be failed to baobab/cypress... Step 3: Unlock the account for using in signing

[blukat29]

2. Gas price recommending RPCs

Please update the RPC descriptions.

• klay_gasPriceAt, kaia_gasPriceAt
  Remove the API. It's deleted since v1.11.0 https://github.com/klaytn/klaytn/releases/tag/v1.11.0
• klay_gasPrice, kaia_gasPrice, eth_gasPrice
  • Description

    Returns a recommended gasPrice for a new transaction.
    
    - Before Magma, returns the fixed UnitPrice
    - After Magma, returns the twice of next baseFee (2*baseFee)
    - After Kaia, returns slightly buffered baseFee plus recommended tip (BaseFee * (1.10 or 1.15) + eth_maxPriorityFeePerGas)
    

  • Result

    Recommended gas price in kei
    

• klay_maxPriorityFeePerGas, kaia_maxPriorityFeePerGas, eth_maxPriorityFeePerGas
  • Description

    Returns a recommended maxPriorityFeePerGas for a new transaction.
    
    - Before Magma, returns the fixed UnitPrice
    - After Magma, returns zero
    - After Kaia, returns zero if network is uncongested (i.e. next baseFee at its lower bound), otherwise 60% percentile effective tip from previous 20 blocks (under default setting)
    

  • Result

    Recommended maxPriorityFeePerGas in kei