API: Add new Get Inbound User (#3644)

* Add GetInboundUser in proto

* Add get user logic for all existing inbounds

* Add inbounduser command

* Add option to get all users

* Fix shadowsocks2022 config

* Fix init users in shadowsocks2022

* Fix copy

* Add inbound user count command

This api costs much less than get inbound user, could be useful in some case

* Update from latest main

proxy/vless/inbound/inbound.go

@@ -172,6 +172,21 @@ func (h *Handler) RemoveUser(ctx context.Context, e string) error {
 	return h.validator.Del(e)
 }
 
+// GetUser implements proxy.UserManager.GetUser().
+func (h *Handler) GetUser(ctx context.Context, email string) *protocol.MemoryUser {
+	return h.validator.GetByEmail(email)
+}
+
+// GetUsers implements proxy.UserManager.GetUsers().
+func (h *Handler) GetUsers(ctx context.Context) []*protocol.MemoryUser {
+	return h.validator.GetAll()
+}
+
+// GetUsersCount implements proxy.UserManager.GetUsersCount().
+func (h *Handler) GetUsersCount(context.Context) int64 {
+	return h.validator.GetCount()
+}
+
 // Network implements proxy.Inbound.Network().
 func (*Handler) Network() []net.Network {
 	return []net.Network{net.Network_TCP, net.Network_UNIX}