chore: Add generics to typescript generator (#4664)

* feat: Support generating generics in interfaces
* Switch struct to a template
* Support generics in apitypings

coderd/util/slice/slice.go

@@ -22,6 +22,21 @@ func Overlap[T comparable](a []T, b []T) bool {
 	})
 }
 
+// Unique returns a new slice with all duplicate elements removed.
+// This is a slow function on large lists.
+// TODO: Sort elements and implement a faster search algorithm if we
+// really start to use this.
+func Unique[T comparable](a []T) []T {
+	cpy := make([]T, 0, len(a))
+	for _, v := range a {
+		v := v
+		if !Contains(cpy, v) {
+			cpy = append(cpy, v)
+		}
+	}
+	return cpy
+}
+
 func OverlapCompare[T any](a []T, b []T, equal func(a, b T) bool) bool {
 	// For each element in b, if at least 1 is contained in 'a',
 	// return true.