Big infrastructure features todo list

[lahmatiy]

• AST
• Immutable paths hoisting (reduce computations -> performance)
• Smart computation caching across queries
• Query parts performance stat
• Query transforming, e.g. query merge, subquery to a query, context inlining
• Syntax highlighting
• Prettifier
• Move jison to dev dependencies
• Debugging (step by step evaluation)
• Input data shape prediction suitable for a query (based on touching paths)