Missing `_disableInitializers()` in implementation contract

The Oracle contract inherits from UUPSUpgradeable and uses an initializer pattern, but it does not disable initializers in its constructor.

# The current implementation only has an init function:
function init(address owner) public initializer {
    _grantRole(AccessControlStorage.DEFAULT_ADMIN_ROLE, owner);
}

Without _disableInitializers() in the constructor, there's a risk that someone could initialize the implementation contract directly, which could lead to unexpected behavior or potential security issues.

To mitigate this issue, it is recommended to add _disableInitializers() in the constructor of the implementation contract.