BridgeIdentityFetcher typedef
Fetches the workspace identity name reported by the bridge on host:port,
or null if the bridge does not answer / has no identifiable workspace.
The identity name is the open .code-workspace file's name, or the
workspace root folder basename when no .code-workspace is open.
Implementation
typedef BridgeIdentityFetcher = Future<String?> Function(String host, int port);