feat: add associateOperator and dissociateOperator to support self-delegate

Description

This PR would collaborate with https://github.com/ExocoreNetwork/exocore/pull/125 to make self-delegate possible. As Chuang's design doc presents, there are generally three types of client chains regarding self-delegate process:

the client chains that are EVM-compatible
the client chains that have other types of VMs and could be bridged to Exocore
the client chains that have no VM

For type 1 client chains, to associate an EVM address with an operator address is simple: the authority that holds the key for the EVM address could always send an EVM transaction to Exocore and call ExocoreGateway.associateOpratorWithEVMStaker, since the EVM address should remain the same for the same private key no matter which EVM-compatible chain the transaction is sent to.

function associateOperatorWithEVMStaker(uint32 clientChainId, string calldata operator)
        external
        whenNotPaused
        isValidBech32Address(operator)
    {}

function dissociateOperatorFromEVMStaker(uint32 clientChainId) external whenNotPaused {
}

Things get more difficult for type 2 client chains: even for the same private key, owing to different cryptographic schemes, the address could be different for EVM and other VM, and we can't link these two addresses without knowing the private key. So in this case, staker should initiate the request from client chain and send the request to Exocore via bridge, so that we could link a Non-EVM address with an operator address.

function requestAssociateOperatorWithStaker(uint32 srcChainId, uint64 lzNonce, bytes calldata payload)
        public
        onlyCalledFromThis
{
}

function requestDissociateOperatorFromStaker(uint32 srcChainId, uint64 lzNonce, bytes calldata payload)
        public
        onlyCalledFromThis
    {
}

It is most difficult for type 3 client chains, where we have to recover staker's address from its signature in Exocore's contracts and then link that address with some operator address. We would leave this for future implementation as it brings many complexities.

Summary by CodeRabbit

New Features
- Added functionality to associate and dissociate operators with EVM stakers.
- Introduced events for successful operator association and dissociation.
- Enhanced the IDelegation interface with new functions for operator-staker management.
- Added new mappings and functions in mock contracts for better testing of operator-staker relationships.
Bug Fixes
- Corrected comment directive for unused imports to align with static analysis tools.
Chores
- Removed outdated address validation logic to simplify contract functionality.

Walkthrough

The recent updates enhance the capabilities of smart contracts managing operator-staker associations. New public functions have been added for associating and dissociating operators, while outdated validation logic has been removed. These modifications aim to streamline operations in the multi-chain ecosystem, improving interactions and clarity in contract management.

Changes

Files	Change Summary
`src/core/ExocoreGateway.sol`, `src/interfaces/precompiles/IDelegation.sol`	Introduced functions for associating/dissociating operators with EVM stakers, enhancing management capabilities and clarifying parameter names.
`src/storage/BootstrapStorage.sol`	Removed address validation constants and logic, simplifying address handling within the contract.
`src/storage/ExocoreGatewayStorage.sol`, `src/storage/GatewayStorage.sol`	Added new constants, events, and a validation modifier for address formats, improving error handling and operation clarity.
`test/foundry/unit/ExocoreGateway.t.sol`	Enhanced tests for operator association/dissociation, including new events and coverage for edge case scenarios.
`test/mocks/DelegationMock.sol`	Introduced mappings and functions for managing operator-staker associations, improving error handling and contract usability.

Sequence Diagram(s)

sequenceDiagram
    participant Staker
    participant Operator
    participant Gateway

    Staker->>Gateway: Request Associate Operator
    Gateway->>Operator: Validate Staker
    Operator-->>Gateway: Confirmation
    Gateway-->>Staker: Association Success

sequenceDiagram
    participant Staker
    participant Operator
    participant Gateway

    Staker->>Gateway: Request Dissociate Operator
    Gateway->>Operator: Validate Staker Association
    Operator-->>Gateway: Confirmation
    Gateway-->>Staker: Dissociation Success

Poem

🐰 In the meadow where the bunnies play,
New changes sprout, brightening the day.
Operators and stakers, hand in paw,
Build a network, with no flaw.
With hops of joy, we celebrate,
Smart contracts dance, oh, isn’t it great! 🎉

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ExocoreNetwork / exocore-contracts