feat: add Amvstrm as provider for stream URL

Summary:

Test Plan:

src/controllers/episodes/getEpisodeUrl/amvstrm.ts

@@ -0,0 +1,75 @@
+import type { FetchUrlResponse } from "./responseType";
+
+export async function getSourcesFromAmvstrm(
+  watchId: string,
+): Promise<FetchUrlResponse | null> {
+  const source = await fetch(
+    `https://api-amvstrm.nyt92.eu.org/api/v2/stream/${watchId}`,
+  )
+    .then((res) => res.json<AmvstrmStreamResponse>())
+    .then(({ stream }) => {
+      const streamObj = stream?.multi;
+      if (!!streamObj) {
+        return streamObj.main ?? streamObj.backup;
+      }
+    })
+    .then((streamObj) => streamObj?.url);
+
+  if (!source) {
+    return null;
+  }
+
+  return {
+    source,
+    subtitles: [],
+    audio: [],
+  };
+}
+
+interface AmvstrmStreamResponse {
+  code: number;
+  message: string;
+  info: Info;
+  stream: Stream;
+  iframe: Iframe[];
+  plyr: Nspl;
+  nspl: Nspl;
+}
+
+interface Iframe {
+  name: string;
+  iframe: string;
+}
+
+interface Info {
+  title: string;
+  id: string;
+  episode: string;
+}
+
+interface Nspl {
+  main: string;
+  backup: string;
+}
+
+interface Stream {
+  multi: Multi;
+  tracks: Tracks;
+}
+
+interface Multi {
+  main: Backup;
+  backup: Backup;
+}
+
+interface Backup {
+  url: string;
+  label: string;
+  isM3U8: boolean;
+  quality: string;
+}
+
+interface Tracks {
+  file: string;
+  kind: string;
+}