Glacier: Community Layout support (#16474)

* Glacier: Community Layout support

Enables the Glacier to use QMK's `tkl_f13_ansi_tsangan` community layout.

- rename `LAYOUT` to `LAYOUT_tkl_f13_ansi_tsangan`
- add `LAYOUTS` rule to `rules.mk`

* info.json: correct maintainer value

Use the maintainer's GitHub username.

keyboards/creatkeebs/glacier/info.json

@@ -1,9 +1,12 @@
 {
     "keyboard_name": "glacier",
     "url": "",
-    "maintainer": "Tim",
+    "maintainer": "Timliuzhaolu",
+    "layout_aliases": {
+        "LAYOUT": "LAYOUT_tkl_f13_ansi_tsangan"
+    },
     "layouts": {
-        "LAYOUT": {
+        "LAYOUT_tkl_f13_ansi_tsangan": {
             "layout": [
                 {"x":0, "y":0},
                 {"x":1.25, "y":0},