feat(risingwave): support tumble and hop window agg

[litaxc]

Description of changes

Implement the visit_WindowAggregate function as it is done in Flink.

Issues closed

Resolves #11969

[deepyaman]

Can you add tests for this similar to ibis/backends/flink/tests/test_window.py and ibis/backends/pyspark/tests/test_window.py? TBH I'm not sure where there aren't also tests for hopping windows in these.

Alternatively, it could also be an option to centralize the window tests in ibis/backends/tests/test_window.py, and to only test some of these options for streaming backends, but I think it's probably easiest to take the first route for now.

[litaxc]

I added tests for the tumble and hop functions.
I increased the window size to one day (it was 30 seconds in both Flink and PySpark's tests) to make the engine actually aggregate something.
Let me know if you prefer the original setting.

[deepyaman]

Looks good overall, very much aligned to the Flink implementation (which is great). @cpcloud / @gforsyth / @NickCrews could one of you kick off the CI workflow?

[deepyaman]

Maybe should use a different slide so that it's not essentially a hopping window? :) I'm sure it works, but even reviewing at a glance I just noticed the results are the same.

[litaxc]

I tried using size=20 days, but I couldn't quite understand the resulting window_start/end produced by RisingWave. So I changed back to use the same size and slide to ensure I would't introduce wrong results.