Rename ruff_python_whitespace to ruff_python_trivia (#5886)

## Summary

This crate now contains utilities for dealing with trivia more broadly:
whitespace, newlines, "simple" trivia lexing, etc. So renaming it to
reflect its increased responsibilities.

To avoid conflicts, I've also renamed `Token` and `TokenKind` to
`SimpleToken` and `SimpleTokenKind`.

crates/ruff_python_formatter/src/statement/stmt_with.rs

@@ -3,7 +3,7 @@ use rustpython_parser::ast::{Ranged, StmtAsyncWith, StmtWith, Suite, WithItem};
 
 use ruff_formatter::{format_args, write, FormatError};
 use ruff_python_ast::node::AnyNodeRef;
-use ruff_python_whitespace::{SimpleTokenizer, TokenKind};
+use ruff_python_trivia::{SimpleTokenKind, SimpleTokenizer};
 
 use crate::comments::trailing_comments;
 use crate::expression::parentheses::{
@@ -125,7 +125,7 @@ fn are_with_items_parenthesized(
 
     let mut tokenizer = SimpleTokenizer::new(context.source(), before_first_with_item)
         .skip_trivia()
-        .skip_while(|t| t.kind() == TokenKind::Async);
+        .skip_while(|t| t.kind() == SimpleTokenKind::Async);
 
     let with_keyword = tokenizer.next().ok_or(FormatError::syntax_error(
         "Expected a with keyword, didn't find any token",
@@ -133,13 +133,13 @@ fn are_with_items_parenthesized(
 
     debug_assert_eq!(
         with_keyword.kind(),
-        TokenKind::With,
+        SimpleTokenKind::With,
         "Expected with keyword but at {with_keyword:?}"
     );
 
     match tokenizer.next() {
         Some(left_paren) => {
-            debug_assert_eq!(left_paren.kind(), TokenKind::LParen);
+            debug_assert_eq!(left_paren.kind(), SimpleTokenKind::LParen);
             Ok(true)
         }
         None => Ok(false),