ES6 - Make plugin compatible with ES6

[camc314]

Summary of changes

Dashboard.getConfigurationPageUrl() is removed from Jellyfin.

const getConfigurationPageUrl = (name) => {
    return 'configurationpage?name=' + encodeURIComponent(name);
}

---

ApiClient -> window.ApiClient

---

define() is removed, export default instead of the return (ES6)

---

require([Dashboard.getConfigurationResourceUrl('Chart.bundle.min.js')], function (d3) {

->

import(
    window.ApiClient.getUrl("web/ConfigurationPage", {
        name: "Chart.bundle.min.js",
    })
).then(({default: d3}) => {

(ES6)