Fix some parser bugs

[NTTVy03]

1. Remove pub in the syntax test programs module
2. Format: add line breaks for better readability:
3. Remove some unused comments in syntax tests
4. Make Pragma optional
5. Remove ROOT in circom_program parser
6. Rename close() params (marker_close --> marker_open)
7. Use advance() in eat()
8. Fix typo scrope --> scope
9. Parse params using list_identity::parse() in template and function parser

[vuvoth]

Pre-approve! Fix Rust format before we merge!