Shorthand to query all entities

**Is your feature request related to a problem? Please describe.**
## Description
Create a special value `ALL` that can be used as the `first` argument in list queries to fetch all entities.

**Describe the solution you'd like**
## Example
```python
swaps = uniswapV2.Query.swaps(
orderBy=uniswapV2.Swap.timestamp,
orderDirection='desc',
first=ALL
)
```

*Originally from: cvauclair*

Look at the query building logic in subgrounds, likely in a module like query.py or client.py. Understand how the 'first' argument is currently handled and parsed. The change involves adding a special constant (like ALL) that bypasses the typical pagination limit. Check existing tests for query construction to see how to add this feature and ensure it integrates with the GraphQL request generation.

Scritto dal modello di indicizzazione a partire dal testo della issue.