feat: autocomplete with single "

[juleswritescode]

• fix policy completions – seem to be broken

given select | from public.users "u" or select | from public.users u…

• autocomplete with single " -> results in "u"."email" or "email"
• autocomplete within double "" -> results in "u"."email" or "email"
• recognize aliases regardless of whether they are quoted or not:
  • "u".| and u.| will both suggest email
  • "u"."| and u."| and "u"."|" and u."|" will all suggest "email"
  • This does not yet work for tables -> separate PR
• existing behavior without quotes is unaffected

[psteinroe]

has_uneven_quotes - this is getting ridiculous 😂