refactor(evm): move evmante handlers into separate package

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Commits
Files that changed from the base of the PR and between 0c35c05d352dd778b62dd62606ab1eb3beb66b1c and 02219eec5b9658684462c7b180afecf24e744724.

Walkthrough

The recent updates focus on refactoring the Ethereum Virtual Machine (EVM) antehandlers into a dedicated evmante package, enhancing code modularity and clarity. This restructuring improves the organization of transaction handling and testing utilities, making it easier to maintain and extend Ethereum-related functionalities within the Nibiru blockchain framework. Multiple files have been modified to reflect this new architecture, ensuring a coherent implementation across the application.

Changes

Files	Change Summary
`CHANGELOG.md`	Added entry for refactoring EVM antehandlers into `evmante` package, emphasizing modularity and maintainability.
`app/ante.go`, `app/ante/gas_wanted.go`, `app/ante/gas_wanted_test.go`, `app/evmante/...`	Refactored code by moving Ethereum-related handling to `evmante`, updating function calls and package declarations, enhancing clarity and organization.
`app/evmante/evmante_*.go`	New and refactored decorators for EVM transaction processing, focusing on specific responsibilities and utilizing `EVMKeeper`.
`app/evmante/*_test.go`	Updated tests to utilize new package structure and centralized utility functions, enhancing maintainability and clarity in testing Ethereum functionalities.
`x/common/testutil/evm/evmante.go`	Introduced utility functions for testing Ethereum transactions, including no-op handlers and transaction builders, to facilitate easier testing scenarios.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant App
    participant Evmante
    participant EvmKeeper

    User->>App: Send Ethereum transaction
    App->>Evmante: Process transaction
    Evmante->>EvmKeeper: Validate transaction details
    EvmKeeper-->>Evmante: Return validation result
    Evmante-->>App: Process result and emit events
    App-->>User: Transaction confirmation

🐇 "In a world of code, so bright and new,
Refactoring brings a splendid view!
EVM paths now dance with grace,
In the evmante space, they find their place.
With tests and functions all aligned,
A modular dream, perfectly designed!" 🐰✨

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NibiruChain / nibiru