Add a query level

Why it matters

This feature allows users to selectively enable the experimental delta-kernel-rs implementation for specific queries. It facilitates testing and gradual adoption of the new delta kernel, which may improve query performance or add new capabilities.

How to use it

To use this feature, set the query setting allow_experimental_delta_kernel_rs to 1 or true in your query, for example:

SELECT * FROM table SETTINGS allow_experimental_delta_kernel_rs = 1;