Cloudpickle and data classes do not play well together

When restoring a value of a `dataclass` with cloudpickle, it breaks:

Example
```
import dataclasses
from dataclasses import dataclass

@dataclass
class Range:
start: int
end: int

v = Range(1, 2)
print("defined")
print(dataclasses.fields(v))

import cloudpickle

print("imported cloudpickle")
print(dataclasses.fields(v))

v_dumped = cloudpickle.dumps(v)

print("dumped with cloudpickle")
print(dataclasses.fields(v))

vv = cloudpickle.loads(v_dumped)
print("loaded with cloudpickle")
print(dataclasses.fields(v))

print("restored value")
print(dataclasses.fields(vv))
```

Leads to
```
defined
(Field(name='start',type=,default=,default_factory=,init=True,repr=True,hash=None,compare=True,metadata=mappingproxy({}),_field_type=_FIELD), Field(name='end',type=,default=,default_factory=,init=True,repr=True,hash=None,compare=True,metadata=mappingproxy({}),_field_type=_FIELD))
imported cloudpickle
(Field(name='start',type=,default=,default_factory=,init=True,repr=True,hash=None,compare=True,metadata=mappingproxy({}),_field_type=_FIELD), Field(name='end',type=,default=,default_factory=,init=True,repr=True,hash=None,compare=True,metadata=mappingproxy({}),_field_type=_FIELD))
dumped with cloudpickle
(Field(name='start',type=,default=,default_factory=,init=True,repr=True,hash=None,compare=True,metadata=mappingproxy({}),_field_type=_FIELD), Field(name='end',type=,default=,default_factory=,init=True,repr=True,hash=None,compare=True,metadata=mappingproxy({}),_field_type=_FIELD))
loaded with cloudpickle
()
restored value
()
```

I.e. as soon as we restore, the type of the data class is destroyed