Feature request: Expose the sync API to all client/server connections

I'm implementing this feature here:
https://github.com/microsoft/vscode-wasm/blob/main/sync-api-client/README.md
in pylance.

And it seems to me that this could be a common feature for just about every language server that uses vscode-languageserver.

Maybe something that would be exposed through a new capability.

Then on the server side you could use the new sync methods.

protected async getFileSystem() {
        return this._connection.workspace.getSyncFileSystem();
}

private _readFile(filePath: string) {
     const fs = this.getFileSystem();
    const bytes = fs.readFile(filePath);
    return this._decoder.decode(bytes, 'utf-8');
}

Start with the sync-api-client/README.md example and the LSP 3.17 client_registerCapability specification. Trace how client/server connections and workspace methods are exposed in this TypeScript package, including getSyncFileSystem(). Done means the sync API is consistently available through the relevant capability and connection interfaces for supported clients and servers.