[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/Verifier.swift

@@ -53,8 +53,8 @@ public struct Verifier {
   public init(
     buffer: inout ByteBuffer,
     options: VerifierOptions = .init(),
-    checkAlignment: Bool = true
-  ) throws {
+    checkAlignment: Bool = true) throws
+  {
     guard buffer.capacity < FlatBufferMaxSize else {
       throw FlatbuffersErrors.exceedsMaxSizeAllowed
     }
@@ -187,19 +187,19 @@ public struct Verifier {
     if offset > 0 {
       reportedOverflow =
         _int32Position
-        .subtractingReportingOverflow(offset.magnitude)
+          .subtractingReportingOverflow(offset.magnitude)
     } else {
       reportedOverflow =
         _int32Position
-        .addingReportingOverflow(offset.magnitude)
+          .addingReportingOverflow(offset.magnitude)
     }
 
     /// since `subtractingReportingOverflow` & `addingReportingOverflow` returns true,
     /// if there is overflow we return failure
     if reportedOverflow.overflow
       || reportedOverflow.partialValue
-        > _buffer
-        .capacity
+      > _buffer
+      .capacity
     {
       throw FlatbuffersErrors.signedOffsetOutOfBounds(
         offset: Int(offset),