feat: implement forloop.name as found in ruby shopify/liquid

src/drop/forloop-drop.ts

@@ -2,10 +2,12 @@ import { Drop } from './drop'
 
 export class ForloopDrop extends Drop {
   protected i = 0
+  public name: string
   public length: number
-  public constructor (length: number) {
+  public constructor (length: number, collection: string, variable: string) {
     super()
     this.length = length
+    this.name = `${variable}-${collection}`
   }
   public next () {
     this.i++

src/drop/tablerowloop-drop.ts

@@ -2,8 +2,8 @@ import { ForloopDrop } from './forloop-drop'
 
 export class TablerowloopDrop extends ForloopDrop {
   private cols: number
-  public constructor (length: number, cols: number) {
-    super(length)
+  public constructor (length: number, cols: number, collection: string, variable: string) {
+    super(length, collection, variable)
     this.length = length
     this.cols = cols
   }