refactor: add #[non_exhaustive] attributes to enums

[lucasfernog]

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

• Bugfix
• Feature
• Code style update
• Refactor
• Documentation
• 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]

Note that this is a breaking change so it'll release wry v0.11. If you wanna release again soon, maybe this PR shouldn't be merged.

[wusyong]

If tauri doesn't need it at the moment, I suppose we could keep the PR until next release.

[lucasfernog]

Yeah, I only did this to prevent accidental breaking changes in the future.

[lemarier]

@wusyong should we minor bump wry too?