PurchasedProductsFetcher: cache current entitlements

[NachoSoto]

To optimize potentially computing offline CustomerInfo, this caches what's likely the most expensive part.

[NachoSoto]

This isn't quite working.

[NachoSoto]

It's also making an integration test (I'm glad we have coverage for this there too):

@available(iOS 15.0, tvOS 15.0, watchOS 8.0, macOS 12.0, *)
func testPurchasingTwoProductsWhileServerIsDown() async throws {
    let product1 = try await self.monthlyPackage.storeProduct
    let product2 = try await self.annualPackage.storeProduct

    self.serverDown()

    _ = try await Purchases.shared.purchase(product: product1)
    let info = try await Purchases.shared.purchase(product: product2).customerInfo

    try await self.verifyEntitlementWentThrough(info)
    expect(info.allPurchasedProductIdentifiers) == [
        product1.productIdentifier,
        product2.productIdentifier
    ]
}

[tonidero]

So you are planning to cache the transactions instead of the whole offline customer info? While that should probably solve the performance concerns it might not help to support fetching customer info from cache while in offline entitlements mode, unless we add support for recalculating it there.

[NachoSoto]

it might not help to support fetching customer info from cache while in offline entitlements mode, unless we add support for recalculating it there.

The SDK already always returns customer info from the cache regardless of the mode. Is there a particular scenario you think wouldn't work?

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 6 lines in your changes missing coverage. Please review.

Project coverage is 87.81%. Comparing base (c0c6893) to head (1b61a82).
Report is 1130 commits behind head on main.

Files with missing lines	Patch %	Lines
...flineEntitlements/OfflineCustomerInfoCreator.swift	70.00%	3 Missing ⚠️
...OfflineEntitlements/PurchasedProductsFetcher.swift	92.00%	2 Missing ⚠️
...s/Logging/Strings/OfflineEntitlementsStrings.swift	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2507      +/-   ##
==========================================
- Coverage   87.82%   87.81%   -0.02%     
==========================================
  Files         198      198              
  Lines       13632    13685      +53     
==========================================
+ Hits        11972    12017      +45     
- Misses       1660     1668       +8     

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