Add support for demo files

Author: ostenbom

scripts/jev/DEMO_COMMANDS.md

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+p playwright test change-name --no-deps --debug
+p jev:test
+p jev:viewer

scripts/jev/example-aria-snapshot.yml

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+- generic [ref=e1]:
+  - generic [ref=e2]:
+    - generic [ref=e4]:
+      - link "ACME" [ref=e5] [cursor=pointer]:
+        - /url: /
+      - button "0" [ref=e10]
+    - generic [ref=e14]:
+      - complementary [ref=e15]:
+        - navigation [ref=e16]:
+          - link [ref=e17] [cursor=pointer]:
+            - /url: /dashboard
+            - button "Team" [ref=e18]
+          - link [ref=e19] [cursor=pointer]:
+            - /url: /dashboard/general
+            - button "General" [active] [ref=e20]
+          - link [ref=e21] [cursor=pointer]:
+            - /url: /dashboard/activity
+            - button "Activity" [ref=e22]
+          - link [ref=e23] [cursor=pointer]:
+            - /url: /dashboard/security
+            - button "Security" [ref=e24]
+      - main [ref=e25]:
+        - generic [ref=e72]:
+          - heading "General Settings" [level=1] [ref=e73]
+          - generic [ref=e74]:
+            - generic [ref=e75]: Account Information
+            - generic [ref=e78]:
+              - generic [ref=e79]:
+                - generic [ref=e80]: Name
+                - textbox "Name" [ref=e81]:
+                  - /placeholder: Enter your name
+              - generic [ref=e82]:
+                - generic [ref=e83]: Email
+                - textbox "Email Email" [ref=e84]:
+                  - /placeholder: Enter your email
+                  - text: 0tj764k2drye@example.com
+              - button "Save Changes" [ref=e85]
+  - alert [ref=e71]