Validate ext_debug_utils extension when calling set_debug_utils_object_name

[Matusson]

1. Update documentation to reflect any user-facing changes - in this repository.

2. Make sure that the changes are covered by unit-tests.

3. Run cargo clippy on the changes.

4. Run cargo +nightly fmt on the changes.

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6. Describe in common words what is the purpose of this change, related
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This change adds validation for Device::set_debug_utils_object_name that checks if the required extension is enabled on the instance. Previously calling it without the extension enabled would panic in ash code, this hopefully makes the issue easier to understand.

Changelog:

### Breaking changes
Changes to `devices`:
- `Device::set_debug_utils_object_name` now validates that the `ext_debug_utils` extension is enabled on the instance.
- `Device::set_debug_utils_object_name` is now marked unsafe.