Fixes [CF-19].
This allows specifying `CustomerInfoManager` fetching behavior, both as a public API for users, and also internally.
Some future uses of `CustomerInfoManager` might want to ensure that we don't rely on cached data, for example.
Thanks to the `APITester` we know that the existing methods still work, this is purely an additive change.
This is the core of the change:
```swift
/// Specifies the behavior for a caching API.
@objc(RCCacheFetchPolicy)
public enum CacheFetchPolicy: Int {
/// Returns values from the cache, or throws an error if not available.
case fromCacheOnly
/// Always fetch the most up-to-date data.
case fetchCurrent
/// Returns the cached data if available and not stale, or fetches up-to-date data.
case notStaleCachedOrFetched
/// Default behavior: returns the cached data if available (even if stale), or fetches up-to-date data.
case cachedOrFetched
/// Default ``CacheFetchPolicy`` behavior.
public static let `default`: Self = .cachedOrFetched
}
```
The new `CustomerInfoManagerGetCustomerInfoTests` check all the different combinations of fetching behavior.
I've taken some of the existing tests and refactored them to be `async`, as well as added a bunch more tests.
> **Note**:
There is also one big hidden bug fix:
`Purchases.getCustomerInfo` now calls `BackendError.asPurchasesError`, so we don't end up returning an internal error type.
This was missed because we always return generic `Error` types, so we have no way to know at compile time that we only return `ErrorCode`s.
[CF-19]: https://revenuecats.atlassian.net/browse/CF-19?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ
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