Need a new GraphQL API to get the genesis public key

### Is your feature request related to a problem?

_No response_

### Describe the solution you'd like

Like the ```genesisAddress``` method, i need a graphQL API to query the network to find the genesis public key of a transaction

### Additional context

_No response_

### Epic

_No response_

Start by locating the existing genesisAddress GraphQL method and its schema or resolver. Trace how it queries the network, then define the corresponding query for a transaction's genesis public key and verify that the schema and response meet the requested behavior.

Written by the indexing model from the issue text.