Add SwiftFormat to the project. (#129)

* Run swiftformat for whitespace.
* Run swiftformat with some rules.

ElementX/Sources/Services/Media/MediaProvider.swift

@@ -6,8 +6,8 @@
 //  Copyright © 2022 Element. All rights reserved.
 //
 
-import UIKit
 import Kingfisher
+import UIKit
 
 struct MediaProvider: MediaProviderProtocol {
     private let clientProxy: ClientProxyProtocol
@@ -21,7 +21,7 @@ struct MediaProvider: MediaProviderProtocol {
         self.clientProxy = clientProxy
         self.imageCache = imageCache
         self.backgroundTaskService = backgroundTaskService
-        self.processingQueue = DispatchQueue(label: "MediaProviderProcessingQueue", attributes: .concurrent)
+        processingQueue = DispatchQueue(label: "MediaProviderProcessingQueue", attributes: .concurrent)
     }
     
     func imageFromSource(_ source: MediaSource?) -> UIImage? {

ElementX/Sources/Services/Media/MediaSource.swift

@@ -23,6 +23,6 @@ struct MediaSource: Equatable {
     // MARK: - Equatable
     
     static func == (lhs: MediaSource, rhs: MediaSource) -> Bool {
-        return lhs.underlyingSource.url() == rhs.underlyingSource.url()
+        lhs.underlyingSource.url() == rhs.underlyingSource.url()
     }
 }

ElementX/Sources/Services/Media/MockMediaProvider.swift

@@ -12,18 +12,18 @@ import UIKit
 struct MockMediaProvider: MediaProviderProtocol {
     
     func imageFromSource(_ source: MediaSource?) -> UIImage? {
-        return nil
+        nil
     }
     
     func loadImageFromSource(_ source: MediaSource) async -> Result<UIImage, MediaProviderError> {
-        return .failure(.failedRetrievingImage)
+        .failure(.failedRetrievingImage)
     }
     
     func imageFromURLString(_ urlString: String?) -> UIImage? {
-        return nil
+        nil
     }
         
     func loadImageFromURLString(_ urlString: String) async -> Result<UIImage, MediaProviderError> {
-        return .failure(.failedRetrievingImage)
+        .failure(.failedRetrievingImage)
     }
 }