Add DocumentLink.tooltip api proposal

For #72824

src/vs/workbench/api/common/extHost.protocol.ts

@@ -996,6 +996,7 @@ export interface LinkDto {
 	cacheId?: ChainedCacheId;
 	range: IRange;
 	url?: string | UriComponents;
+	tooltip?: string;
 }
 
 export interface CodeLensDto extends ObjectIdentifier {

src/vs/workbench/api/common/extHostTypeConverters.ts

@@ -808,7 +808,8 @@ export namespace DocumentLink {
 	export function from(link: vscode.DocumentLink): modes.ILink {
 		return {
 			range: Range.from(link.range),
-			url: link.target
+			url: link.target,
+			tooltip: link.tooltip
 		};
 	}
 

src/vs/workbench/api/common/extHostTypes.ts

@@ -1440,6 +1440,8 @@ export class DocumentLink {
 
 	target?: URI;
 
+	tooltip?: string;
+
 	constructor(range: Range, target: URI | undefined) {
 		if (target && !(target instanceof URI)) {
 			throw illegalArgument('target');