feat(macOS): Add AppHandle::show() and AppHandle::hide()

[probablykasper]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Docs
• New Binding Issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes. Issue #___
• No

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:
Exposes macOS-only show_application and hide_application from tao.

[probablykasper]

@amrbashir Any idea why the build-artifacts action is failing, or how to go about fixing it? The EventLoopWindowTargetExtMacOS trait is imported, and app_handle.show() does work when I run tauri dev.

error[E0599]: no method named `show_application` found for reference `&EventLoopWindowTarget<Message>` in the current scope
    --> /Users/runner/work/tauri/tauri/core/tauri-runtime-wry/src/lib.rs:1952:20
     |
1952 |         event_loop.show_application();
     |                    ^^^^^^^^^^^^^^^^ method not found in `&EventLoopWindowTarget<Message>`

[amrbashir]

don't know really, but I think the updater-test-artifacts workflow has been broken for a while. @lucasfernog might have a better idea.

[probablykasper]

@amrbashir @lucasfernog either of you wanna give this one a look so it can be merged?

[lucasfernog]

@amrbashir @lucasfernog either of you wanna give this one a look so it can be merged?

I think this one will need to wait for v2.

[probablykasper]

Opened PR #3689 instead, from a different branch