Documentation feedback on /docs/feature: Educate readers about the power of SQL VIEWs

### Documentation feedback

- Page title: Advanced Querying
- Page URL: https://cratedb.com/docs/guide/feature/index.html
- Source: https://github.com/crate/cratedb-guide/blob/main/docs/feature/index.html

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> Rockset Query Lambdas are named, parameterized SQL queries stored in Rockset that can be executed from a dedicated REST endpoint.
>
> -- https://docs.rockset.com/documentation/docs/query-lambdas

It has been brought to our attention that those are actually just [SQL VIEW](https://cratedb.com/docs/crate/reference/en/latest/general/ddl/views.html)s? If that is the case, I think this feature deserves to receive a dedicated high-level feature page as well, why not in roughly the same spirit like Rockset's page is doing it?

Start with docs/feature/index.html and compare its Advanced Querying content with the linked SQL VIEW reference and Rockset Query Lambdas example. Confirm how SQL VIEWs map to the described use case, then define and add a dedicated high-level explanation in the feature documentation. Done means readers can understand the feature and find the relevant reference material.

Written by the indexing model from the issue text.