Telemetry support for SPFx Toolkit. Closes #570

[Saurabh7019]

🎯 Aim

This PR adds telemetry support for SPFx Toolkit to help us understand how the extension is used and improve its features.

📷 Result

App Insights

CSV report

✅ What was done

• [] Proper way of handling the AI connection string
• [] AI capabilities such as chat participants and LM tools
• [] Usage of vscode.open actions
• Created a centralized telemetry service
• Extension lifecycle tracking - Activation, Deactivation
• Authentication actions tracking - Login/Logout
• Usage of actions from the Actions view
• Usage of actions from the Tasks view
• App management actions including adding app catalog, managing tenant-wide extensions, and managing SPFx apps
• Support to disable telemetry through VS Code settings
• Updated documentation

✅ How to test

• Set up application insights and get your AI connection string
• Search for key 'aiConnectionString' in package.json and replace the value
• Run the PR locally and click on below actions:

🔗 Related issue

Closes: #570

[Adam-it]

uuuu looks interesting.... I will try to give it a check/review next week unless someone is quicker than me🤩