[New Rule]: rewrite dict.get(key, None) as dict.get(key)

## Explanation

`dict.get(key)` returns `None` by default if `key` is missing.

## Example

```python
# Bad
dict.get(key, None)

# Good
dict.get(key)
```


## Related

Adding this rule should be coordinated with https://github.com/charliermarsh/ruff/issues/3546 for consistent naming.