Add ServerInfo identification of the LS

[radeksimko]

https://microsoft.github.io/language-server-protocol/specifications/specification-current/#initialize

interface InitializeResult {
	/**
	 * The capabilities the language server provides.
	 */
	capabilities: ServerCapabilities;

	/**
	 * Information about the server.
	 *
	 * @since 3.15.0
	 */
	serverInfo?: {
		/**
		 * The name of the server as defined by the server.
		 */
		name: string;

		/**
		 * The server's version as defined by the server.
		 */
		version?: string;
	};
}

[radeksimko]

This requires some upstream changes https://github.com/sourcegraph/go-lsp/blob/b19bb38222e24b57a93b803229b83f1eb113095d/service.go#L212-L214 or us switching to a fork or a different library altogether.

[ghost]

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