Add typing hints to `isa` to assist type inference (#17530)

This requires unfortunately an additional layer of indirection, however
I believe it's super cheap and it shouldn't impact execution speed.

In the mean time, many other predicates (isFoo etc) which rely on isa()
will be correctly type-inferred, which gives a huge win for editing and
debugging purposes.

frontend/src/metabase/lib/types.js

-import { isa, TYPE } from "cljs/metabase.types";
+import { isa as cljs_isa, TYPE } from "cljs/metabase.types";
 
-export { isa, TYPE };
+export { TYPE };
+
+/**
+ * Is x the same as, or a descendant type of, y?
+ *
+ * @example
+ * isa(field.semantic_type, TYPE.Currency);
+ *
+ * @param {string} x
+ * @param {string} y
+ * @return {boolean}
+ */
+export const isa = (x, y) => cljs_isa(x, y);
 
 // convenience functions since these operations are super-common
 // this will also make it easier to tweak how these checks work in the future,