delete more code

pkg/util/mapset/mapset.go

-package mapset
-
-import "sync"
-
-type Set[T comparable] struct {
-	m  map[T]struct{}
-	mu sync.RWMutex
-}
-
-func NewSet[T comparable]() *Set[T] {
-	return &Set[T]{
-		m: make(map[T]struct{}),
-	}
-}
-
-func (s *Set[T]) Add(x T) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	s.m[x] = struct{}{}
-}
-
-func (s *Set[T]) Remove(x T) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	delete(s.m, x)
-}
-
-func (s *Set[T]) Each(fn func(x T) bool) {
-	s.mu.RLock()
-	defer s.mu.RUnlock()
-	for k := range s.m {
-		if !fn(k) {
-			return
-		}
-	}
-}