Implement changes to support passing through raw query result rows #6
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These two commits are necessary for passing through the raw data rows for proxied queries when using the Parse/Bind/Describe/Exec path (as opposed to the SimpleQuery path, where this kind of passthrough is already implemented).
The bulk of the necessary changes are to let us specify custom result formats when we execute a query, since we need to specify the same result formats as the original client query if we want the results we pass through to match what the client expects. We also add a public accessor for the underlying row data on the Row type. See the individual commit messages in this PR for more detail.
(For more context on why I'm making these changes, see readysettech/readyset#268).