Merge #4725

4725: Store primary key as String when Number exceeds i64 range r=irevoire a=JWSong

# Pull Request

## Related issue
Fixes #4696 

## What does this PR do?
- When a Number value exceeding the range of i64 is received as a primary key, it will be stored as a String.

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


Co-authored-by: JWSong <thdwjddn123@gmail.com>

milli/src/documents/primary_key.rs

@@ -166,7 +166,7 @@ pub fn validate_document_id_value(document_id: Value) -> StdResult<String, UserE
             Some(s) => Ok(s.to_string()),
             None => Err(UserError::InvalidDocumentId { document_id: Value::String(string) }),
         },
-        Value::Number(number) if number.is_i64() => Ok(number.to_string()),
+        Value::Number(number) if !number.is_f64() => Ok(number.to_string()),
         content => Err(UserError::InvalidDocumentId { document_id: content }),
     }
 }