HnswDocumentIndex treats document IDs as string, they can be str, int, ID

### Initial Checks

- [X] I have read and followed [the docs](https://docs.docarray.org/) and still think this is a bug

### Description

I noticed this behavior when I wanted to access multiple documents in the index:

```python
@requests(on='/find')
    def find(self, docs: DocList[QuoteFile], **_) -> DocList[QuoteFile]:
        return self._cache_di[docs.id]
```

And when I issue POST /find with body `{"data":[{"id":"300055"}]}`, this code yields:
```bash
       "/Users/oytuntez/motaword/jina-documents/venv/lib/py…                    
       line 544, in _get_docs_sqlite_doc_id                                     
           hashed_ids = tuple(self._to_hashed_id(id_) for                       
       id_ in doc_ids)                                                          
         File                                                                   
       "/Users/oytuntez/motaword/jina-documents/venv/lib/py…                    
       line 544, in <genexpr>                                                   
           hashed_ids = tuple(self._to_hashed_id(id_) for                       
       id_ in doc_ids)                                                          
         File                                                                   
       "/Users/oytuntez/motaword/jina-documents/venv/lib/py…                    
       line 445, in _to_hashed_id                                               
           return                                                               
       int(hashlib.sha256(doc_id.encode('utf-8')).hexdigest…                    
       16) % 10**18                                                             
       AttributeError: 'int' object has no attribute                            
       'encode'                        
```

Upon investigation, I saw that most of `HnswDocumentIndex` treats IDs as `str`. However, it is my understanding that IDs can be `int`, see this type definition:

```python
class ID(str, AbstractType):
    """
    Represent an unique ID
    """

    @classmethod
    def _docarray_validate(
        cls: Type[T],
        value: Union[str, int, UUID],
...
```

I think ID values should be cast to `str` if necessary (it would be in `_to_hashed_id` case).

### Example Code

_No response_

### Python, DocArray & OS Version

```Text
Python 3.8.12
docarray==0.40.0
```


### Affected Components

- [X] [Vector Database / Index](https://docs.docarray.org/user_guide/storing/docindex/)
- [ ] [Representing](https://docs.docarray.org/user_guide/representing/first_step)
- [ ] [Sending](https://docs.docarray.org/user_guide/sending/first_step/)
- [X] [storing](https://docs.docarray.org/user_guide/storing/first_step/)
- [X] [multi modal data type](https://docs.docarray.org/data_types/first_steps/)

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HnswDocumentIndex treats document IDs as string, they can be str, int, ID #1850

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HnswDocumentIndex treats document IDs as string, they can be str, int, ID #1850

Description

Initial Checks

Description

Example Code

Python, DocArray & OS Version

Affected Components

Activity

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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