feat(styles): add custom get deep maps function

styles/base/_functions.scss

@@ -0,0 +1,19 @@
+@use 'sass:map';
+@use 'sass:meta';
+@use 'sass:list';
+
+@function custom-map-get($map, $keys...) {
+  $current-map: $map;
+  $i: 1;
+
+  @if meta.type-of($map) == map {
+    @while $i <= length($keys) {
+      $current-map: map.get($current-map, list.nth($keys, $i));
+      $i: $i + 1;
+    }
+  } @else {
+    @error "The #{$current-map} provided is not an actual map.";
+  }
+
+  @return $current-map;
+}