SQLite: Support INDEXED BY and NOT INDEXED

[LucaCappelletti94]

Support SQLite’s INDEXED BY index_name and NOT INDEXED clauses in SELECT, UPDATE and DELETE, including SELECT * FROM t AS x INDEXED BY i. These clauses impose index-selection requirements, with INDEXED BY requiring the named index to be usable. See https://www.sqlite.org/lang_indexedby.html

SQLite enables parsing through Dialect::supports_indexed_by(). TableFactor::Table::index_directives holds a Vec<TableIndexDirective> covering MySQL’s index hints and SQLite’s index-selection requirements. This is a breaking API change for consumers of index_hints, and MySQL hints are wrapped in TableIndexDirective::MySql(TableIndexHints { .. }).

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.30%. Comparing base (ada8314) to head (31a5379).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ast/query.rs	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2687      +/-   ##
==========================================
+ Coverage   81.28%   81.30%   +0.02%     
==========================================
  Files          42       42              
  Lines       33920    33968      +48     
  Branches    33920    33968      +48     
==========================================
+ Hits        27571    27619      +48     
  Misses       2785     2785              
  Partials     3564     3564              

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.