[feat] Show a message if a newer version of `tauri-cli` is available

[beardgans]

Describe the problem

tauri-cli can be installed via npm or cargo.
At the moment there is no opportunity to know that the new version of tauri-cli came out.

Describe the solution you'd like

My suggestion is to show a message if a new version of tauri-cli is available.
This will be an indicator for a user that it's time to update.

Alternatives considered

I found this useful feature in the GitHub CLI application and npm.

Additional context

Ready-made crates to implement that:

• https://github.com/mgrachev/update-informer
• https://github.com/tarikeshaq/update-notifier