Refactor evmEvents for Better Code Quality

[zsystm]

Description and context

The current implementation of evmEvents contains multiple logical operations directly within the function, which should be separated into distinct functions.

• Fetching logs from ethereum client
• Converting those logs to EVMEvent objects
• Verifying the converted events
• Sorting the events

This approach limits testability, as it prevents writing tests for specific logic handled by evmEvents and increases complexity by combining too many responsibilities.

Suggested solution

Refactor by delegating separable logic into dedicated functions. For example, we can serpate the following logics to other functions.

• Geth log conversion and verification
• Sorting EVMEvents

Definition of done

#106 is merged