chore: add filter to ListMachines

pkg/api/machine.go

@@ -2,6 +2,14 @@ package api
 
 import "github.com/psviderski/uncloud/internal/machine/api/pb"
 
+// MachineFilter defines criteria to filter machines in ListMachines.
+type MachineFilter struct {
+	// Available filters machines that are not DOWN.
+	Available bool
+	// NamesOrIDs filters machines by their names or IDs.
+	NamesOrIDs []string
+}
+
 type MachineMembersList []*pb.MachineMember
 
 func (m MachineMembersList) FindByManagementIP(ip string) *pb.MachineMember {