[refurb] Implement isinstance-type-none (FURB168) (#8308)

## Summary

Implement
[`no-isinstance-type-none`](https://github.com/dosisod/refurb/blob/master/refurb/checks/builtin/no_isinstance_type_none.py)
as `isinstance-type-none` (`FURB168`).

Auto-fixes calls to `isinstance` to check if an object is `None` to a
`None` identity check. For example,

```python
isinstance(foo, type(None))
```

becomes

```python
foo is None
```

Related to #1348.

## Test Plan

`cargo test`

---------

Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>

ruff.schema.json

@@ -2820,6 +2820,8 @@
         "FURB140",
         "FURB145",
         "FURB148",
+        "FURB16",
+        "FURB168",
         "FURB17",
         "FURB171",
         "FURB177",