v3.0.0-rc.7 - Githubissues

Changes in this pull request

Exposes the transactionBackgroundView PaywallOption to Objective-C by making it non-optional and adding a none case in place of setting it to nil.
Renames getPaywallViewController to getPaywall.
Renames paywallStatePublisher property on PaywallViewController to statePublisher.
Changes the presentation error domain code from SWPresentationError to SWKPresentationError.

Adds paywall caching. This is disabled by default but we'll roll this out to users accounts remotely. With this enhancement, your paywalls will load lightning fast and will reduce network load of your app.
Exposes Logging SuperwallOption to Objective C.
Exposes info on the PaywallViewController.
Adds rawTrialPeriodPrice, trialPeriodPrice, trialPeriodDailyPrice, trialPeriodWeeklyPrice, trialPeriodMonthlyPrice, trialPeriodYearlyPrice.

Fixes issue where a crash would occur if storage was full and a persistent container couldn't be created.
Fixes thread safety issue when using a lazy variable to retrieve products.
If the internet is offline when trying to present a paywall, the paywall configuration hasn't been retrieved, and the user is not subscribed, it now throws a presentationError. If the internet reconnects future paywalls will show.
Fixes retry logic for requests.
Fixes crash when handling a deep link.
Creates a strong reference to the purchase controller as it was getting deallocated if you didn't keep a hold on it.

[x] All tests pass. Demo project builds and runs.
[x] I added tests, an experiment, or detailed why my change isn't tested.
[x] I added an entry to the CHANGELOG.md for any breaking changes, enhancements, or bug fixes.
[x] I have run swiftlint in the main directory and fixed any issues.
[ ] I have updated the SDK documentation as well as the online docs.
[x] I have reviewed the contributing guide