[DO NOT MERGE] draft playing around with EVM codebase

[k-yang]

This pull request includes multiple changes to the x/evm/keeper and eth/rpc/pubsub files to improve code clarity and functionality. The most important changes involve renaming variables for better readability, simplifying function signatures, and removing unnecessary return values.

Codebase simplification:

• x/evm/keeper/call_contract.go: Simplified the CallContractWithInput function by removing the evmObj return value. [1] [2] [3] [4]
• x/evm/keeper/grpc_query.go: Removed unnecessary return values in several functions, including EthCall, EstimateGasForEvmCallType, TraceTx, TraceCall, TraceBlock, and TraceEthTxMsg. [1] [2] [3] [4] [5] [6]
• x/evm/keeper/msg_server.go: Simplified the ApplyEvmMsg function by removing the evmObj return value and renaming the function parameters for better readability. [1] [2] [3] [4] [5] [6]

Variable renaming for better readability:

• eth/rpc/pubsub/pubsub.go: Renamed the name parameter to topicName in several functions to improve clarity. [1] [2] [3]

Removal of unused code:

• x/evm/keeper/keeper.go: Removed the BaseFeeWeiPerGas and Tracer functions as they were no longer needed.

Minor bug fixes:

• app/evmante/evmante_can_transfer.go: Fixed a bug by using ctd.EVMKeeper.NewStateDB instead of ctd.NewStateDB.
• x/evm/keeper/funtoken_from_coin.go: Removed an unnecessary return value in the deployERC20ForBankCoin function.# Purpose / Abstract

• Closes #AAA

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