feat(core): window menus

[lucasfernog]

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

• Bugfix
• Feature
• 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:

[lucasfernog]

Converted to draft because we need to decide what to do with the keyboard accelerators.

[lucasfernog]

Accelerators support will be added in a future release.

[lucasfernog]

This will be hidden behind a feature flag in another PR.

[lucasfernog]

This will be hidden behind a feature flag in another PR.

I'll also refactor the API a little bit since it's tricky to use the MenuItemId currently, and we should move the listener to the menu fn itself.