[Swift] Improves vectors performance & arrays within lib (#8415)

* Improves vectors performance and adds a benchmark to vectors of offsets in swift

Improves performance for all arrays and for loops

Uses a tuple instead of allocating a struct each time we start iterating over fieldloc

Updates benchmark library

* Fixing swift Wasm ci

benchmarks/swift/Benchmarks/FlatbuffersBenchmarks/FlatbuffersBenchmarks.swift

@@ -178,4 +178,24 @@ let benchmarks = {
     let root = Offset(offset: fb.endTable(at: start))
     fb.finish(offset: root)
   }
+
+  Benchmark("Vector of Offsets") { benchmark in
+    let rawSize = ((16 * 5) * benchmark.scaledIterations.count) / 1024
+    var fb = FlatBufferBuilder(initialSize: Int32(rawSize * 1600))
+    benchmark.startMeasurement()
+    for _ in benchmark.scaledIterations {
+      let offsets = [
+        fb.create(string: "T"),
+        fb.create(string: "2"),
+        fb.create(string: "3"),
+      ]
+      let off = fb.createVector(ofOffsets: [
+        fb.createVector(ofOffsets: offsets),
+        fb.createVector(ofOffsets: offsets),
+      ])
+      let s = fb.startTable(with: 2)
+      fb.add(offset: off, at: 2)
+      blackHole(fb.endTable(at: s))
+    }
+  }
 }

benchmarks/swift/Package.swift

@@ -26,7 +26,7 @@ let package = Package(
     .package(path: "../.."),
     .package(
       url: "https://github.com/ordo-one/package-benchmark",
-      from: "1.12.0"),
+      from: "1.27.0"),
   ],
   targets: [
     .executableTarget(