[Indexer API] No support for validator_transaction

[legonian]

Description

GraphQL API has no support for validator_transaction transaction type.

Repro

Using list of available graphQL tables (https://cloud.hasura.io/public/graphiql?endpoint=https://api.mainnet.aptoslabs.com/v1/graphql) I can find only following transaction related tables:

• block_metadata_transactions
• user_transactions
• account_transactions

But no validator_transaction table. This type was added and used only recently but is important to have.

Example of transaction of this type: https://explorer.aptoslabs.com/txn/975859175?network=mainnet