iOS Swift Conversion (#2527)

Converts iOS implementation from Objective-c to Swift

# During the conversion process some updates to the code structure were also made
- Modularize codebase from single file to smaller focused files
- Untangled large nested IF statements
- Added more null checks, since Swift is more strict with null pointers
- Added property to allow for decoding of local video sources with self contained key for offline playback
- Updates example apps to test react-native 0.63.4 and uses auto native dependency imports for android and ios

ios/Video/Features/RCTVideoErrorHandling.swift

@@ -0,0 +1,103 @@
+enum RCTVideoError : Int {
+    case fromJSPart
+    case noLicenseServerURL
+    case licenseRequestNotOk
+    case noDataFromLicenseRequest
+    case noSPC
+    case noDataRequest
+    case noCertificateData
+    case noCertificateURL
+    case noFairplayDRM
+    case noDRMData
+    case invalidContentId
+}
+
+enum RCTVideoErrorHandler {
+    
+    static let noDRMData = NSError(
+        domain: "RCTVideo",
+        code: RCTVideoError.noDRMData.rawValue,
+        userInfo: [
+            NSLocalizedDescriptionKey: "Error obtaining DRM license.",
+            NSLocalizedFailureReasonErrorKey: "No drm object found.",
+            NSLocalizedRecoverySuggestionErrorKey: "Have you specified the 'drm' prop?"
+        ])
+    
+    static let noCertificateURL = NSError(
+        domain: "RCTVideo",
+        code: RCTVideoError.noCertificateURL.rawValue,
+        userInfo: [
+            NSLocalizedDescriptionKey: "Error obtaining DRM License.",
+            NSLocalizedFailureReasonErrorKey: "No certificate URL has been found.",
+            NSLocalizedRecoverySuggestionErrorKey: "Did you specified the prop certificateUrl?"
+        ])
+    
+    static let noCertificateData = NSError(
+        domain: "RCTVideo",
+        code: RCTVideoError.noCertificateData.rawValue,
+        userInfo: [
+            NSLocalizedDescriptionKey: "Error obtaining DRM license.",
+            NSLocalizedFailureReasonErrorKey: "No certificate data obtained from the specificied url.",
+            NSLocalizedRecoverySuggestionErrorKey: "Have you specified a valid 'certificateUrl'?"
+        ])
+    
+    static let noSPC = NSError(
+        domain: "RCTVideo",
+        code: RCTVideoError.noSPC.rawValue,
+        userInfo: [
+            NSLocalizedDescriptionKey: "Error obtaining license.",
+            NSLocalizedFailureReasonErrorKey: "No spc received.",
+            NSLocalizedRecoverySuggestionErrorKey: "Check your DRM config."
+        ])
+    
+    static let noLicenseServerURL = NSError(
+        domain: "RCTVideo",
+        code: RCTVideoError.noLicenseServerURL.rawValue,
+        userInfo: [
+            NSLocalizedDescriptionKey: "Error obtaining DRM License.",
+            NSLocalizedFailureReasonErrorKey: "No license server URL has been found.",
+            NSLocalizedRecoverySuggestionErrorKey: "Did you specified the prop licenseServer?"
+        ])
+    
+    static let noDataFromLicenseRequest = NSError(
+        domain: "RCTVideo",
+        code: RCTVideoError.noDataFromLicenseRequest.rawValue,
+        userInfo: [
+            NSLocalizedDescriptionKey: "Error obtaining DRM license.",
+            NSLocalizedFailureReasonErrorKey: "No data received from the license server.",
+            NSLocalizedRecoverySuggestionErrorKey: "Is the licenseServer ok?"
+        ])
+    
+    static func licenseRequestNotOk(_ statusCode: Int) -> NSError {
+        return NSError(
+            domain: "RCTVideo",
+            code: RCTVideoError.licenseRequestNotOk.rawValue,
+            userInfo: [
+                NSLocalizedDescriptionKey: "Error obtaining license.",
+                NSLocalizedFailureReasonErrorKey: String(
+                    format:"License server responded with status code %li",
+                    (statusCode)
+                ),
+                NSLocalizedRecoverySuggestionErrorKey: "Did you send the correct data to the license Server? Is the server ok?"
+            ])
+    }
+
+    static func fromJSPart(_ error: String) -> NSError {
+        return NSError(domain: "RCTVideo",
+            code: RCTVideoError.fromJSPart.rawValue,
+            userInfo: [
+                NSLocalizedDescriptionKey: error,
+                NSLocalizedFailureReasonErrorKey: error,
+                NSLocalizedRecoverySuggestionErrorKey: error
+            ])
+    }
+    
+    static let invalidContentId = NSError(
+        domain: "RCTVideo",
+        code: RCTVideoError.invalidContentId.rawValue,
+        userInfo: [
+            NSLocalizedDescriptionKey: "Error obtaining DRM license.",
+            NSLocalizedFailureReasonErrorKey: "No valide content Id received",
+            NSLocalizedRecoverySuggestionErrorKey: "Is the contentId and url ok?"
+        ])
+}