Support Phased Releases Endpoint

[Sherlouk]

To be merged after #125

Adds support for getting the phased release status.

Will test in my own app (using the fork) to quickly ensure it actually works hitting the real service. Will check in once done 👍

[Sherlouk]

Confirmed working.

Request

provider.request(.appStoreVersionPhasedRelease(ofVersionWithId: "UUID")) { request in
    print(request)
}

Response

success(AppStoreConnect_Swift_SDK.AppStoreVersionPhasedReleaseResponse(data: AppStoreConnect_Swift_SDK.AppStoreVersionPhasedReleaseResponse.Data(id: "UUID", attributes: Optional(AppStoreConnect_Swift_SDK.AppStoreVersionPhasedReleaseResponse.Attributes(currentDayNumber: Optional(1), phasedReleaseState: Optional(AppStoreConnect_Swift_SDK.PhasedReleaseState.active), startDate: Optional(2020-12-14 10:16:45 am +0000), totalPauseDuration: Optional(0))), type: "appStoreVersionPhasedReleases"), links: AppStoreConnect_Swift_SDK.PagedDocumentLinks(first: nil, next: nil, self: https://api.appstoreconnect.apple.com/v1/appStoreVersions/UUID/appStoreVersionPhasedRelease)))

[AvdLee]

You've combined both your previous PR and this PR together. Shouldn't be a problem but something to keep an eye on!

[Sherlouk]

Aye sorry, that was intentional - wanted to test both changes on a single branch!

If they get merged in order shouldn't cause any problems. Sorry about that

[SwiftLeeBot]

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📖	AppStoreConnect-Swift-SDK: Executed 161 tests, with 0 failures (0 unexpected) in 0.468 (1.038) seconds

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[Sherlouk]

d'oh
probably need to set the Locale on my date formatter so it's consistent no matter where you run the tests!

[Sherlouk]

Separated the two PRs, fixed the CI issues on the correct branch. Hopefully should be good 👍

[SwiftLeeBot]

Congratulations! 🎉 This was released as part of Release 1.3.0 🚀

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