Format UnaryExpr

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## Summary

This PR adds basic formatting for unary expressions.

<!-- What's the purpose of the change? What does it do, and why? -->

## Test Plan

I added a new `unary.py` with custom test cases

crates/ruff_python_formatter/src/lib.rs

@@ -411,11 +411,10 @@ Formatted twice:
     #[test]
     fn quick_test() {
         let src = r#"
-
-def foo(
-    b=3
-    + 2  # comment
-):
+if [
+    aaaaaa,
+    BBBB,ccccccccc,ddddddd,eeeeeeeeee,ffffff
+] & bbbbbbbbbbbbbbbbbbddddddddddddddddddddddddddddbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb:
     ...
 "#;
         // Tokenize once