feat: add SetTextCall handler and update schema

[kenyiu]

After the upgrade of ENS resolver to version 2, the text changed events no longer emits the value field.

event TextChanged(bytes32 indexed node, string indexed indexedKey, string key);

So, the graph data no longer have the value field from the textChanged. This PR is to add handler for receiving data from the SetTextCall.

Let me know if anything else would be needed for contributing. Thanks.