Transactions Updates for Data Connect

Firebase Data Connect, now renamed SQL Connect, has expanded its transaction capabilities to allow operations within a transaction to use query results from earlier steps. Using a banking-transfer example, the update enables account balances to be adjusted, queried, and recorded in a transaction log entirely on the server in one atomic operation, rather than returning balances to client code and sending them back in a separate mutation. A new `response` binding exposes partial results from prior top-level transaction fields, while scalar `_expr` fields can accept dynamic values from earlier results, authentication tokens, or computations. The `@redact` directive can prevent sensitive queried data, such as account balances, from being returned to clients or included in generated SDKs while retaining it for subsequent server-side steps. Results can also be used with `@check` expressions to enforce conditions, such as preventing a transfer that would leave an account with a negative balance, while preserving relational-database-style atomicity and reducing client-server round trips.

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