Add Separate Grammar for CQL (Cassandra Query Language)

Hey there!

I’d like to suggest adding a **dedicated grammar for CQL (Cassandra Query Language)** instead of grouping it under SQL.

Right now, `cql` code blocks are highlighted using the SQL grammar, but CQL syntax is quite different, no joins, different data types, and its own DDL/DML structure. Having a standalone grammar would make syntax highlighting much more accurate.

I’ve been working on **native CQL support for the Zed editor** via an [extension](https://zed.dev/extensions?query=CQL), which currently has around **15k downloads** and grows by about **2-3k new installs each month**.

It includes:

- A full **CQL 3.4+ grammar**
- **Extensions for DataStax HCD**
- **Planned ScyllaDB vector search support**

Both the grammar and the language server are open source and actively maintained:

- [**Tree-sitter grammar:**](https://github.com/Akzestia/tree-sitter-cql)
- [**Language server:**](https://github.com/Akzestia/cqlls)

Would love to see `cql` get its own grammar entry to better reflect the language’s syntax. Happy to help or test if needed!