[Swift] Implements FlatbuffersVector which confirms to RandomAccessCollection (#8752)

* Implements FlatbuffersVector in swift

Implements FlatbuffersVector which confirms to RandomAccessCollection,
this would give us semi-native sugary syntax to all the arrays in swift port.

This work will also be the foundation of using arrays in swift

* Fix failing tests for Swift

swift/Sources/FlatBuffers/FlatbuffersErrors.swift

@@ -63,13 +63,13 @@ public enum FlatbuffersErrors: Error, Equatable {
 
 #if !os(WASI)
 
-  extension FlatbuffersErrors {
-    public static func == (
-      lhs: FlatbuffersErrors,
-      rhs: FlatbuffersErrors
-    ) -> Bool {
-      lhs.localizedDescription == rhs.localizedDescription
-    }
+extension FlatbuffersErrors {
+  public static func == (
+    lhs: FlatbuffersErrors,
+    rhs: FlatbuffersErrors) -> Bool
+  {
+    lhs.localizedDescription == rhs.localizedDescription
   }
+}
 
 #endif