Implement workspace/workspaceFolders request

[retailcoder]

Specification (LSP)

The workspace/workspaceFolders request is sent from the server to the client to fetch the current open list of workspace folders. Returns null in the response if only a single file is open in the tool. Returns an empty array if a workspace is open but no folders are configured.

Where WorkspaceFolder is defined as follows:

export interface WorkspaceFolder {
	/**
	 * The associated URI for this workspace folder.
	 */
	uri: DocumentUri;

	/**
	 * The name of the workspace folder. Used to refer to this
	 * workspace folder in the user interface.
	 */
	name: string;
}

Scope:

• Rubberduck.Core add-in client must define a service that holds client-side workspace state.
• Rubberduck.Client library must define a client-side handler for this request, that returns the folders in the current workspace.