`rsp.jax` special implementations (`CFAR`, `CFARCASO`, `PointCloud`) do not have a consistent API

[thetianshuhuang]

Unlike the rest of rsp.jax, CFAR, CFARCASO, and PointCloud are not batched.

• We should either allow batches, or document that we expect the caller to vmap.

There's also a few ergonomic issues with the API and documentation:

• we should explicitly call out that rsp.jax supports additional features.
• many parameters like range_resolution in PointCloud should provide a default
• parameters should be better documented, including how they are used and their physical meanings
• axis names are not consistent (ele vs el, azi vs az)