Don't tokenize identifiers after dots as keywords

FIX: Don't tokenize identifiers after periods as anything but plain identifiers.

See https://discuss.codemirror.net/t/custom-highlighting-for-property-names-in-sql/7729

src/tokens.ts

@@ -308,7 +308,8 @@ export function tokensFor(d: Dialect) {
       input.acceptToken(Punctuation)
     } else if (isAlpha(next)) {
       let word = readWord(input, String.fromCharCode(next))
-      input.acceptToken(input.next == Ch.Dot ? Identifier : d.words[word.toLowerCase()] ?? Identifier)
+      input.acceptToken(input.next == Ch.Dot || input.peek(-word.length - 1) == Ch.Dot
+        ? Identifier : d.words[word.toLowerCase()] ?? Identifier)
     }
   })
 }