Add support for scene tree info on macOS & iOS

[limbonaut]

On macOS and iOS, the scene tree information (aka view hierarchy) is not rendered properly. The Cocoa SDK backend does not expose the necessary bits for adding VH attachment. To address this, we need to introduce these missing elements. In particular, the backend SDK currently does not support setting the attachment_type attribute in the public API, which is essential for sentry.io to identify the attachment as the view hierarchy.

• Depends on Expose SentryAttachment's attachmentType for Internal SDKs sentry-cocoa#6491
• PR feat: Add view hierarchy attachment support for downstream SDKs sentry-cocoa#6521

[linear]

GODOT-89 Add support for scene tree info on macOS & iOS