[WIP] Xcode 13 support

[shams-ahmed]

Proposed changes:

• Xcode 13 support
• Build SDK using iOS 15
• Removed lots of warnings and errors
• Renamed Network to HTTPNetwork
• Use Trace class directly instead of looking it up at runtime for Swift loading
• Added @available(iOSApplicationExtension, unavailable) to make sure Trace is only linked for iOS

Known issues (as of Xcode 13 beta 5)

• Building project with armv7 fails with a network issue. Known issue reported to Apple

/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS15.0.sdk/System/Library/Frameworks/Combine.framework/Modules/Combine.swiftmodule/armv7-apple-ios.swiftinterface:57:59: 'AnyCancellable' is only available in iOS 13.0 or newer

• Disabled NWPathMonitor logic in Connectivity class
• Trace naming conflicts with the following message:
  public class 'Trace.Trace' shadows module 'Trace', which may cause failures when importing 'Trace' or its clients in some configurations; please rename either the class 'Trace.Trace' or the module 'Trace', or see https://bugs.swift.org/browse/SR-14195 for workarounds

Pre-requisites:

• Reviewed code before asking reviewer (Look at Files Changed below instead of Xcode).
• Reviewed code format follows the style guide where possible.
• Added tests where possible (*compulsory for business logic and new classes).

[sonarqubecloud]

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