[ES|QL] Pretty-printing improvements

[vadimkibana]

The core ES|QL pretty-printing feature has been implement, this issue tracks follow-up to further improve it.

• Pretty-printing for list literals.
• Support comments in list literal expressions.
• Support comments inside AST nodes.
• Allow users to specify one extra blank line in source text, remove more than one blank lines.
• [ES|QL] Improve arithmetic unary expression nodes #189258
• [ES|QL] Introduce rename expression AST nodes #190360
• [ES|QL] Regexp literal AST node improvements #190359
• [ES|QL] Parse SHOW and META command args as column expressions #190356

[elasticmachine]

Pinging @elastic/kibana-esql (Team:ESQL)

[drewdaemon]

Support comments inside AST nodes.

If this means things like my . /* some comment */ field, I don't think we have to invest in supporting these unless they're very easy. See #182393 (comment)