Support for FlatGeoBuf Remote Layers

[sijandh35]

Description

This issue proposes adding support for FlatGeobuf (FGB) datasets as remote vector layers. Users would be able to register a remote FlatGeobuf resource by providing its URL, allowing GeoNode to access large vector datasets hosted externally without downloading them locally.The implementation should leverage the HTTP range request capabilities of the FlatGeobuf format to retrieve essential vector metadata directly from the remote source: CRS, spatial extent and attributes.

If the remote server does not support HTTP range requests, dataset creation should fail gracefully with a clear, user-friendly message explaining that FlatGeobuf remote access requires range request support.When metadata retrieval succeeds, the dataset is registered as a remote vector resource backed by the FlatGeobuf URL.