feat(unstable): add Deno.futime and Deno.futimeSync (#7266)

cli/dts/lib.deno.unstable.d.ts

@@ -1247,6 +1247,40 @@ declare namespace Deno {
   export function createHttpClient(
     options: CreateHttpClientOptions,
   ): HttpClient;
+
+  /** **UNSTABLE**: needs investigation into high precision time.
+   *
+   * Synchronously changes the access (`atime`) and modification (`mtime`) times
+   * of a file stream resource referenced by `rid`. Given times are either in
+   * seconds (UNIX epoch time) or as `Date` objects.
+   *
+   * ```ts
+   * const file = Deno.openSync("file.txt", { create: true });
+   * Deno.futimeSync(file.rid, 1556495550, new Date());
+   * ```
+   */
+  export function futimeSync(
+    rid: number,
+    atime: number | Date,
+    mtime: number | Date,
+  ): void;
+
+  /** **UNSTABLE**: needs investigation into high precision time.
+   *
+   * Changes the access (`atime`) and modification (`mtime`) times of a file
+   * stream resource referenced by `rid`. Given times are either in seconds
+   * (UNIX epoch time) or as `Date` objects.
+   *
+   * ```ts
+   * const file = await Deno.open("file.txt", { create: true });
+   * await Deno.futime(file.rid, 1556495550, new Date());
+   * ```
+   */
+  export function futime(
+    rid: number,
+    atime: number | Date,
+    mtime: number | Date,
+  ): Promise<void>;
 }
 
 declare function fetch(