Add redap tests for dataframe pushdown

[timsaucer]

This is follow on work to #12147 .

This adds explicit tests to see what data come back from our push down filters.

The difference between this and the e2e tests is that the e2e tests will check the result of the full output from datafusion collection. That will go through the FilterExec after our table provider, so the data filtered could be done by datafusion rather than our table provider.

We cannot mark our table provider as Exact because it will send back chunks that have more data than was requested.

This test will get record batches directly from our table provider without going through any of the other mechanisms of DataFusion. We can verify we get exactly the chunks we expect from the server and no more.

In addition to these checks I am adding a client util. Since the TableProvider requires a ConnectionClient we need a little more than just the server hook.

Also I updated one method in the TableProvider that removes a block_on call that makes integration with testing difficult.

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[timsaucer]

Since I ended up with a fair amount of scope creep on this PR, I'm going to open another one with just the updates to the OSS server and existing tests. Then this PR will rebase with only the new tests.

#12328