refactor: use `_handleResponse` to handle all responses to reduce code size

Walkthrough

The changes focus on optimizing the ClientChainGateway and Bootstrap contracts to address code size limitations. By streamlining functionalities, enhancing event handling, and refactoring response processes, the codebase is made more organized and maintainable. Key contracts such as ClientGatewayLzReceiver and ExocoreGateway have been improved for clarity and efficiency, ensuring compliance with deployment constraints while retaining essential functionalities.

Changes

File	Change Summary
`src/core/ClientChainGateway.sol`	Removed redundant response hooks; simplified whitelist management.
`src/core/ClientGatewayLzReceiver.sol`	Centralized response handling in `_handleResponse`; added internal methods for better organization.
`src/core/ExocoreGateway.sol`	Enhanced event emissions; introduced a `result` variable for capturing success status.
`src/interfaces/IClientChainGateway.sol`	Simplified inheritance by removing `ITokenWhitelister`.
`src/storage/BootstrapStorage.sol`	Deleted the `DepositThenDelegateResult` event and its documentation.
`src/storage/ClientChainGatewayStorage.sol`	Replaced `WithdrawRewardResult` with `RequestFinished`; removed `_registeredResponseHooks`.
`src/storage/ExocoreGatewayStorage.sol`	Added new event declarations for asset and staking results.
`src/storage/GatewayStorage.sol`	Introduced a private `__gap` array; updated nonce verification; added inbound nonce mapping.
`test/foundry/Delegation.t.sol`	Modified event definitions; replaced some emissions with `RequestFinished`.
`test/foundry/DepositThenDelegateTo.t.sol`	Replaced `DepositThenDelegateResult` with `DepositResult` and `DelegateResult`, adjusting parameters.
`test/foundry/DepositWithdrawPrinciple.t.sol`	Updated events to use `bytes32`, added new functions and checks, modified event emissions.
`test/foundry/ExocoreDeployer.t.sol`	Added `RequestFinished` event.
`test/foundry/WithdrawReward.t.sol`	Updated `WithdrawRewardResult` to use `bytes32`; introduced `RequestFinished` event.
`test/foundry/unit/ClientChainGateway.t.sol`	Removed functions related to whitelist token management.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant ClientGatewayLzReceiver
    participant ExocoreGateway
    participant Storage

    User->>ClientGatewayLzReceiver: Send Request
    ClientGatewayLzReceiver->>ClientGatewayLzReceiver: _handleResponse
    ClientGatewayLzReceiver->>ExocoreGateway: Process Request
    ExocoreGateway->>Storage: Update State
    ExocoreGateway->>User: Emit Event

    Note over ClientGatewayLzReceiver, ExocoreGateway: Refactored internal handling and event emissions

Assessment against linked issues

Objective (Issues)	Addressed	Explanation
Reduce code size of `ClientChainGateway` and `Bootstrap` (#42)	✅
Improve code readability and organization	✅
Refactor response handling and event emissions	✅
Simplify interface inheritance in `IClientChainGateway`	✅

Poem

In the blockchain's enchanted land,
Contracts trimmed with a careful hand,
Refactored code, events that bloom,
In smart contracts' endless room.
Whitelist trimmed, responses clear,
Code size limits, no more fear!
🐰✨

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ExocoreNetwork / exocore-contracts