Use webpack for bundling JS libs and move Golang code related to Iframe generation there

test/test.go

 package test
 
-import "fmt"
+import (
+	"fmt"
+	"io/ioutil"
+	"strings"
+)
 
-func Foo() {
-	fmt.Println("Test function1")
-}
+func GetClientJsLibrary(iframeUrl string) string {
+	dat, err := ioutil.ReadFile("./javascript/dist/viamapi-client.js")
+
+	if err != nil {
+		fmt.Println(err.Error())
+	}
 
-func Bar() {
-	fmt.Println("Test function2")
+	return strings.Replace(string(dat), "{{urlArg}}", iframeUrl, 1) + "\n"
 }