Improved frontend parser and introduced Sage-Lisp! #75
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This PR implements a new parser and lexer for sage, and gets rid of the
pest
dependency. The new parser and lexer are implemented with LALRPOP and Logos.With the new parser, we can now integrate code-modifying lisp expressions into the code.
![image](https://private-user-images.githubusercontent.com/28228031/326631984-1276dfcd-b499-4cc5-9faf-be6e8821d62b.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.r8Ul1QF53eoRlE-tBbRAHkJAVHkEtiPuvIz1PSVeuok)