Async-await support for the login and registration related calls

[r3econ]

This PR adds an extension with async-await support for the login and registration related calls.

Usage

try await Cidaas.shared.loginWithBrowser(using: viewController)
try await Cidaas.shared.registerWithBrowser(using: viewController)
try await Cidaas.shared.getRequestID()
try await Cidaas.shared.getClientInfo(requestId: requestId)
try await Cidaas.shared.getSocialLoginProviders()
try await Cidaas.shared.getAccessToken(with: refreshToken)
try await Cidaas.shared.loginWithSocial(using: viewController, provider: "facebook", requestID: requestID)