vscode: Make TerminalLink compatible to VS Code 1.64.2

In the course of fixing this, I discovered eclipse-theia#11521.
Turning `TerminalLink` into a class with a constructor will help anyway,
and is effective once eclipse-theia#11521 is fixed.

Fixes eclipse-theia#11507

Contributed on behalf of STMicroelectronics.

Change-Id: I7aa945445cbbe05f09746d7824b3153fec6b38f2
Signed-off-by: Philip Langer <planger@eclipsesource.com>

packages/plugin/src/theia.d.ts

@@ -3097,14 +3097,14 @@ export module '@theia/plugin' {
     /**
      * A link on a terminal line.
      */
-    export interface TerminalLink {
+    export class TerminalLink {
         /**
-         * The start index of the link on [TerminalLinkContext.line](#TerminalLinkContext.line].
+         * The start index of the link on {@link TerminalLinkContext.line}.
          */
         startIndex: number;
 
         /**
-         * The length of the link on [TerminalLinkContext.line](#TerminalLinkContext.line]
+         * The length of the link on {@link TerminalLinkContext.line}.
          */
         length: number;
 
@@ -3116,6 +3116,18 @@ export module '@theia/plugin' {
          * depending on OS, user settings, and localization.
          */
         tooltip?: string;
+
+        /**
+         * Creates a new terminal link.
+         * @param startIndex The start index of the link on {@link TerminalLinkContext.line}.
+         * @param length The length of the link on {@link TerminalLinkContext.line}.
+         * @param tooltip The tooltip text when you hover over this link.
+         *
+         * If a tooltip is provided, is will be displayed in a string that includes instructions on
+         * how to trigger the link, such as `{0} (ctrl + click)`. The specific instructions vary
+         * depending on OS, user settings, and localization.
+         */
+        constructor(startIndex: number, length: number, tooltip?: string);
     }
 
     /**