Build CommentRanges outside the parser (#11792)

## Summary

This PR updates the parser to remove building the `CommentRanges` and
instead it'll be built by the linter and the formatter when it's
required.

For the linter, it'll be built and owned by the `Indexer` while for the
formatter it'll be built from the `Tokens` struct and passed as an
argument.

## Test Plan

`cargo insta test`

crates/ruff_python_trivia_integration_tests/tests/simple_tokenizer.rs

@@ -1,7 +1,7 @@
 use insta::assert_debug_snapshot;
 
 use ruff_python_parser::{parse_unchecked, Mode};
-use ruff_python_trivia::{lines_after, lines_before, SimpleToken, SimpleTokenizer};
+use ruff_python_trivia::{lines_after, lines_before, CommentRanges, SimpleToken, SimpleTokenizer};
 use ruff_python_trivia::{BackwardsTokenizer, SimpleTokenKind};
 use ruff_text_size::{TextLen, TextRange, TextSize};
 
@@ -23,7 +23,8 @@ impl TokenizationTestCase {
 
     fn tokenize_reverse(&self) -> Vec<SimpleToken> {
         let parsed = parse_unchecked(self.source, Mode::Module);
-        BackwardsTokenizer::new(self.source, self.range, parsed.comment_ranges()).collect()
+        let comment_ranges = CommentRanges::from(parsed.tokens());
+        BackwardsTokenizer::new(self.source, self.range, &comment_ranges).collect()
     }
 
     fn tokens(&self) -> &[SimpleToken] {