feat(xmaps): add BuildSet helper to build a set from slice

Author: tdakkota

internal/xmaps/set.go

@@ -0,0 +1,10 @@
+package xmaps
+
+// BuildSet builds a set from the given values.
+func BuildSet[K comparable](s ...K) map[K]struct{} {
+	r := make(map[K]struct{}, len(s))
+	for _, v := range s {
+		r[v] = struct{}{}
+	}
+	return r
+}