feat(amazonq): handle link clicks in /help (#7120)

## Problem
links clicked in help and responsible ai policy don't open

## Solution
implement info link and link click handlers

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: jpinkney-aws

packages/amazonq/src/lsp/chat/messages.ts

@@ -39,14 +39,17 @@ import {
     ShowDocumentRequest,
     contextCommandsNotificationType,
     ContextCommandParams,
+    LINK_CLICK_NOTIFICATION_METHOD,
+    LinkClickParams,
+    INFO_LINK_CLICK_NOTIFICATION_METHOD,
 } from '@aws/language-server-runtimes/protocol'
 import { v4 as uuidv4 } from 'uuid'
 import * as vscode from 'vscode'
 import { Disposable, LanguageClient, Position, TextDocumentIdentifier } from 'vscode-languageclient'
 import * as jose from 'jose'
 import { AmazonQChatViewProvider } from './webviewProvider'
 import { AuthUtil } from 'aws-core-vscode/codewhisperer'
-import { AmazonQPromptSettings, messages } from 'aws-core-vscode/shared'
+import { AmazonQPromptSettings, messages, openUrl } from 'aws-core-vscode/shared'
 import { DefaultAmazonQAppInitContext, messageDispatcher } from 'aws-core-vscode/amazonq'
 
 export function registerLanguageServerEventListener(languageClient: LanguageClient, provider: AmazonQChatViewProvider) {
@@ -172,6 +175,12 @@ export function registerMessageListeners(
                 }
                 break
             }
+            case INFO_LINK_CLICK_NOTIFICATION_METHOD:
+            case LINK_CLICK_NOTIFICATION_METHOD: {
+                const linkParams = message.params as LinkClickParams
+                void openUrl(vscode.Uri.parse(linkParams.link))
+                break
+            }
             case chatRequestType.method: {
                 const chatParams = { ...message.params } as ChatParams
                 const partialResultToken = uuidv4()