feat: Stabilize Deno.consoleSize() API (#15933)

This commit stabilizes "Deno.consoleSize()" API. 

There is one change compared to previous unstable API,
in that the API doesn't accept any arguments. Console size
is established by querying syscalls for stdio streams at fd
0, 1 and 2.

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

@@ -1901,6 +1901,19 @@ declare namespace Deno {
    */
   export const File: typeof FsFile;
 
+  /** Gets the size of the console as columns/rows.
+   *
+   * ```ts
+   * const { columns, rows } = Deno.consoleSize();
+   * ```
+   *
+   * @category I/O
+   */
+  export function consoleSize(): {
+    columns: number;
+    rows: number;
+  };
+
   /** @category I/O */
   export interface SetRawOptions {
     /**