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/abstractSyntaxTree.test.ts

@@ -24,7 +24,10 @@ describe('testing AST', () => {
             type: 'Literal',
             start: 0,
             end: 1,
-            value: 5,
+            value: {
+              suffix: 'None',
+              value: 5,
+            },
             raw: '5',
           },
           operator: '+',
@@ -32,7 +35,10 @@ describe('testing AST', () => {
             type: 'Literal',
             start: 3,
             end: 4,
-            value: 6,
+            value: {
+              suffix: 'None',
+              value: 6,
+            },
             raw: '6',
           },
         },