Database register function based on `OffchainResolver`

[pikonha]

Database register function based on OffchainResolver

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• [X] Have you followed the guidelines in our Contributing document?
• [X] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Description

The DatabaseResolver now follows the OffchainResolver interface by implementing the following register function:

function register(
    bytes32 parentNode,
    string calldata label,
    address owner,
    uint256 duration,
    bytes32 secret,
    address resolver,
    bytes[] calldata data,
    bool reverseRecord,
    uint16 fuses,
    bytes memory extraData
)
    external
    payable;

Related Issue

206

Changes

• [X] New feature implementation
• [ ] Bug fix
• [ ] Code refactoring
• [ ] Documentation update
• [ ] Other (please specify)

Changes to Core Features:

• [X] Have you added an explanation of what your changes do and why you'd like us to include them?
• [X] Have you written new tests for your core changes, as applicable?
• [X] Have you successfully run tests with your changes locally?