Raw query editor to visual query builder improvements

[bossinc]

Currently, there are several glitches with converting from the raw query editor to the visual editor because of the AST. We no longer plan to support our AST, so we need a new solution for this problem. We can leverage an open-source AST to support this conversion.

Improvements

• use oguimbal/pgsql-ast-parser as the AST and replace AST (We use a Postgress AST parser because this is the most developed and active ts/js AST parser. No open-source CH AST parsers are being developed. I tried writing a custom AST parser but ran into too many complex issues that became too time-consuming to solve correctly.)
• process AST before trying to convert and prevent users from converting. Also, when able, give details as to why it cannot convert
• support parsing grafana functions in the new AST (either by extending it or some clever way)