### Changes:
- `InternalAPI` is now `Sendable` to deal with new compilation error
- `PaywallEventStoreType` is now `Sendable`
- Extracted `SK2BeginRefundRequestHelperType` to make
`SK2BeginRefundRequestHelper` `Sendable`
- Updated `MockSK2BeginRefundRequestHelper` to be thread-safe and
`Sendable`
- Fixed compilation error in `DebugContentViews`
- Fixed compilation error in `DebugViewModel`
- Fixed compilation error in `StoreMessagesHelper`
### Context:
`#if os(iOS)` no longer evaluates to `true` when compiling for
`visionOS`
Which means we need `|| os(xrOS)`.
But to support older Xcode we need `#if swift(>=5.9) && os(xrOS)`.
But, fun fact, short-circuiting doesn’t work in `Xcode 13`.
And we still need that to run iOS <15 tests (`FB12223404` /
`FB12805891`)
💩
This works around that by defining our own `VISION_OS` flag.
### Changes:
- Added `VISION_OS` compile time flag to determine SDK
- Replaced `#if os(xrOS)` with `#if VISION_OS`
- Added flag to `Package.swift` (thanks @neonichu for helping with this)
### Changes:
- Exposed `internal`-only `Purchases.cachePresentedOfferingIdentifier`
- Changed `SwiftUI` extensions to `static` methods: this is required to
be able to call an instance method on them
- Added integration test to verify this offering identifier is used
Technically this is an API change, but these APIs are implicitly beta
because they're only available in Xcode 15 beta.
NachoSoto