Add Array function benchmarks (#75)

benchmarks/core/array.gd

@@ -0,0 +1,35 @@
+extends Benchmark
+
+static func create_array(size: int) -> Array[int]:
+	var result : Array[int] = []
+	result.resize(size)
+	for i: int in size:
+		result[i] = i
+	return result
+
+# Creating the `ref` arrays triggers copy-on-write
+
+const ITERATIONS = 1_000_000
+
+var array_10 := create_array(10)
+var array_ref_10 := array_10
+
+var array_100 := create_array(100)
+var array_ref_100 := array_100
+
+func benchmark_reverse() -> void:
+	for i in ITERATIONS:
+		array_10.reverse()
+
+func benchmark_bsearch() -> void:
+	for i in ITERATIONS:
+		var index := array_10.bsearch(array_10[i % array_10.size()])
+		assert(index != -1, "Invalid index could have unexpected results.")
+
+func benchmark_append_array() -> void:
+	for i in ITERATIONS:
+		array_100.append_array(array_10)
+
+func benchmark_fill() -> void:
+	for i in ITERATIONS:
+		array_10.fill(100 + i)