Batch of row filtering improvements, backend RPC cleanup. Add less-equal, greater-equal, null/not-null filter types, put supported features in get_state result

[wesm]

Addresses #2732, #2731

This patch implements a batch of pending improvements. Even though there are backend OpenRPC changes, because it only affects filtering it won't impact the R runtime but the next iteration will need to update the comm.

• Only shows is-empty, is-not-empty filters for string data (see video below)
• Adds >=, <=, is-null, and not-null filter types to the UI
• Adds "condition" for combining filters, either AND (default) or OR and implements this in Python
• Adds "is_valid" field to RowFilter so we can invalidate filters and show them in the UI (support for invalidating filters will come in the next PR)
• Moved SupportedFeatures value to the result of get_state. The state isn't really being used anywhere in the UI so this shouldn't break R

Screencast.from.2024-04-12.16-38-43.webm

[petetronic]

Is the duplicate intentional as part of the test?

[wesm]

Yes, I'll add a comment

[wesm]

I noticed that the != "is not equal to" filter type is missing, so I'll plumb that in now while I'm at this

[wesm]

Here's is-not-equal-to in action. I also fixed the bug when switching comparison types causing the UI to be in a partly invalid state

Screencast.from.2024-04-12.17-10-08.webm

[wesm]

I took R for a spin also to make sure this didn't break anything. Will go ahead and merge this