typemap for luau analyzer, rename "tests" to "luau" and move tests into it

luau/typemap.lua

@@ -0,0 +1,17 @@
+--A type map for the luau analyzer
+type f64 = number
+
+type Vector2 = {x: f64, y: f64}
+type Vector3 = Vector2 & {z: f64}
+type Vector4 = Vector3 & {w: f64}
+
+type fn_Vector3 = (x: f64, y: f64, z: f64) -> Vector3
+local Vector3: fn_Vector3 = Vector3
+
+type fn_Vector3add = (v1: Vector3, v2: Vector3) -> Vector3
+local Vector3add: fn_Vector3add = Vector3add
+
+return {
+	Vector3    = Vector3,
+	Vector3add = Vector3add
+}