[ruff] Handle unary operators in decimal-from-float-literal (RUF032)

[dylwil3]

This PR ensures that the suggested "stringified" float passed to decimal.Decimal does not contain more than one unary operator, and that the rule ignores floats with the invalid unary operators ~ and not. For example,

Decimal(- + - + - +4.0)

has a suggested fix of Decimal("-4.0").

Closes #13258

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

[AlexWaygood]

Thanks! I pushed a commit to reduce the amount of cloning of AST nodes, which can be quite expensive. I also made a few other small simplifications -- let me know if you have any questions about the changes I pushed!

[dylwil3]

I was wondering how to do something like that, so that's super helpful to see - thanks for making the code much nicer!