Parse units on numeric literals and keep them in the AST (#5061)

* Code changes

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* test changes

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Frontend changes

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Refactor asNum

Co-authored-by: Jonathan Tran <jonnytran@gmail.com>

---------

Signed-off-by: Nick Cameron <nrc@ncameron.org>
Co-authored-by: Jonathan Tran <jonnytran@gmail.com>

src/lang/queryAst.test.ts

@@ -660,7 +660,7 @@ myNestedVar = [
       enter: (node, path) => {
         if (
           node.type === 'Literal' &&
-          String(node.value) === literalOfInterest
+          String((node as any).value.value) === literalOfInterest
         ) {
           pathToNode = path
         } else if (