Workspace folders not initialized properly

[rchl]

The initialize request can include a list of workspace folders:

	/**
	 * The workspace folders configured in the client when the server starts.
	 * This property is only available if the client supports workspace folders.
	 * It can be `null` if the client supports workspace folders but none are
	 * configured.
	 *
	 * @since 3.6.0
	 */
	workspaceFolders?: WorkspaceFolder[] | null;

pylsp ignores those during initialize and expects the client to send the workspace/didChangeWorkspaceFolders notification to initialize the workspace folders. Expecting that notification is a bug since it only needs to be called when folders change, relative to the ones reported in initialize.