Add warning for pattern

See typst#5590

Author: MDLC01

crates/typst-library/src/visualize/mod.rs

@@ -52,5 +52,9 @@ pub(super) fn define(global: &mut Scope) {
     global.define_elem::<PathElem>();
 
     // Compatibility.
-    global.define("pattern", Type::of::<Tiling>());
+    global.define_deprecated(
+        "pattern",
+        Type::of::<Tiling>(),
+        "the name `pattern` is deprecated, use `tiling` instead",
+    );
 }

tests/suite/visualize/tiling.typ

@@ -158,6 +158,7 @@
 ]))
 
 --- tiling-pattern-compatibility ---
+// Warning: 2:10-2:17 the name `pattern` is deprecated, use `tiling` instead
 #set page(width: auto, height: auto, margin: 0pt)
 #let t = pattern(size: (10pt, 10pt), line(stroke: 4pt, start: (0%, 0%), end: (100%, 100%)))
 #rect(width: 50pt, height: 50pt, fill: t)