add Order helper

docs/order.md

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+# Order
+
+### `Order.by(fieldName: string).desc`
+
+DESC, In reverse order according to `"fieldName"`
+
+### `Order.by(fieldName: string).asc`
+
+ASC, In ascending order according to `"fieldName"`

order.ts

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+import { replaceParams } from "./util.ts";
+
+export class Order {
+  value: string;
+  static by(field: string) {
+    const order = new Order();
+    return {
+      get desc() {
+        order.value = replaceParams("?? DESC", [field]);
+        return order;
+      },
+      get asc() {
+        order.value = replaceParams("?? ASC", [field]);
+        return order;
+      }
+    };
+  }
+}

test/order.ts

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+import { assertEquals, test } from "../deps.ts";
+import { Order } from "../order.ts";
+
+test(function testOrderBuilder() {
+  assertEquals(Order.by("name").desc.value, "`name` DESC");
+  assertEquals(Order.by("name").asc.value, "`name` ASC");
+});