Add .text-gray-* utility classes (#2619)

Co-authored-by: codecalm <codecalm@gmail.com>

.changeset/add-text-gray-utilities.md

@@ -0,0 +1,5 @@
+---
+"@tabler/core": minor
+---
+
+Added `.text-gray-*` utility classes (`.text-gray-50` through `.text-gray-950`) alongside the existing `.bg-gray-*` and `.text-gray-*-fg` utilities.

core/scss/utils/_colors.scss

@@ -78,6 +78,10 @@
   .text-#{'' + $color}-fg {
     color: var(--#{$prefix}#{$color}-fg) !important;
   }
+
+  .text-#{'' + $color} {
+    color: var(--#{$prefix}#{$color}) !important;
+  }
 }
 
 @each $color, $value in $social-colors {