Pass FormatContext to NeedsParentheses

<!--
Thank you for contributing to Ruff! To help us out with reviewing, please consider the following:

- Does this pull request include a summary of the change? (See below.)
- Does this pull request include a descriptive title?
- Does this pull request include references to any relevant issues?
-->

## Summary

I started working on this because I assumed that I would need access to options inside of `NeedsParantheses` but it then turned out that I won't. 
Anyway, it kind of felt nice to pass fewer arguments. So I'm gonna put this out here to get your feedback if you prefer this over passing individual fiels. 

Oh, I sneeked in another change. I renamed `context.contents` to `source`. `contents` is too generic and doesn't tell you anything. 

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

## Test Plan

It compiles

crates/ruff_python_formatter/src/expression/expr_tuple.rs

@@ -1,5 +1,5 @@
 use crate::builders::optional_parentheses;
-use crate::comments::{dangling_comments, CommentLinePosition, Comments};
+use crate::comments::{dangling_comments, CommentLinePosition};
 use crate::expression::parentheses::{
     default_expression_needs_parentheses, parenthesized, NeedsParentheses, Parentheses,
     Parenthesize,
@@ -131,10 +131,9 @@ impl NeedsParentheses for ExprTuple {
     fn needs_parentheses(
         &self,
         parenthesize: Parenthesize,
-        source: &str,
-        comments: &Comments,
+        context: &PyFormatContext,
     ) -> Parentheses {
-        match default_expression_needs_parentheses(self.into(), parenthesize, source, comments) {
+        match default_expression_needs_parentheses(self.into(), parenthesize, context) {
             Parentheses::Optional => Parentheses::Never,
             parentheses => parentheses,
         }
@@ -148,7 +147,7 @@ fn is_parenthesized(
     f: &mut Formatter<PyFormatContext<'_>>,
 ) -> bool {
     let parentheses = '(';
-    let first_char = &f.context().contents()[usize::from(tuple_range.start())..]
+    let first_char = &f.context().source()[usize::from(tuple_range.start())..]
         .chars()
         .next();
     let Some(first_char) = first_char else {