Move Q003 to AST checker (#10923)

## Summary

This PR moves the `Q003` rule to AST checker.

This is the final rule that used the docstring detection state machine
and thus this PR removes it as well.

resolves: #7595 
resolves: #7808 

## Test Plan

- [x] `cargo test`
- [x] Make sure there are no changes in the ecosystem

crates/ruff_linter/src/checkers/ast/analyze/string_like.rs

@@ -33,4 +33,7 @@ pub(crate) fn string_like(string_like: StringLike, checker: &mut Checker) {
     if checker.enabled(Rule::UnnecessaryEscapedQuote) {
         flake8_quotes::rules::unnecessary_escaped_quote(checker, string_like);
     }
+    if checker.enabled(Rule::AvoidableEscapedQuote) && checker.settings.flake8_quotes.avoid_escape {
+        flake8_quotes::rules::avoidable_escaped_quote(checker, string_like);
+    }
 }

crates/ruff_linter/src/checkers/tokens.rs

@@ -16,7 +16,7 @@ use crate::registry::{AsRule, Rule};
 use crate::rules::pycodestyle::rules::BlankLinesChecker;
 use crate::rules::{
     eradicate, flake8_commas, flake8_executable, flake8_fixme, flake8_implicit_str_concat,
-    flake8_pyi, flake8_quotes, flake8_todos, pycodestyle, pygrep_hooks, pylint, pyupgrade, ruff,
+    flake8_pyi, flake8_todos, pycodestyle, pygrep_hooks, pylint, pyupgrade, ruff,
 };
 use crate::settings::LinterSettings;
 
@@ -122,10 +122,6 @@ pub(crate) fn check_tokens(
         );
     }
 
-    if settings.rules.enabled(Rule::AvoidableEscapedQuote) && settings.flake8_quotes.avoid_escape {
-        flake8_quotes::rules::avoidable_escaped_quote(&mut diagnostics, tokens, locator, settings);
-    }
-
     if settings.rules.any_enabled(&[
         Rule::SingleLineImplicitStringConcatenation,
         Rule::MultiLineImplicitStringConcatenation,

crates/ruff_linter/src/lib.rs

@@ -24,7 +24,6 @@ mod docstrings;
 mod fix;
 pub mod fs;
 mod importer;
-mod lex;
 pub mod line_width;
 pub mod linter;
 pub mod logging;

crates/ruff_linter/src/registry.rs

@@ -256,7 +256,6 @@ impl Rule {
             | Rule::MixedSpacesAndTabs
             | Rule::TrailingWhitespace => LintSource::PhysicalLines,
             Rule::AmbiguousUnicodeCharacterComment
-            | Rule::AvoidableEscapedQuote
             | Rule::BlanketNOQA
             | Rule::BlanketTypeIgnore
             | Rule::BlankLineAfterDecorator

crates/ruff_linter/src/rules/flake8_quotes/helpers.rs

@@ -1,3 +1,12 @@
+use ruff_python_ast::AnyStringKind;
+use ruff_text_size::TextLen;
+
+/// Returns the raw contents of the string given the string's contents and kind.
+/// This is a string without the prefix and quotes.
+pub(super) fn raw_contents(contents: &str, kind: AnyStringKind) -> &str {
+    &contents[kind.opener_len().to_usize()..(contents.text_len() - kind.closer_len()).to_usize()]
+}
+
 /// Return `true` if the haystack contains an escaped quote.
 pub(super) fn contains_escaped_quote(haystack: &str, quote: char) -> bool {
     for index in memchr::memchr_iter(quote as u8, haystack.as_bytes()) {