query.ebnf(expression): sync with query.pest

Summarize the changes

• query.ebnf(expression): sync with query.pest

Affected diagrams:

• expression — Диаграмма expression
• literal — Диаграмма literal
• call — Диаграмма call
• type — Диаграмма type

Extracted diagrams:

• case — Диаграмма case
• to_char
• to_date
• trim — Диаграмма trim

• query.ebnf: proofread

Ensure that

• New code is covered by unit and integration tests.
• Related issues would be automatically closed with gitlab's closing pattern (Closes #1, #2).
• Public modules are documented (check the rendered version with cargo doc --open).
• (if PEST grammar is changed) EBNF grammar reflects these changes (check the result with railroad diagram generator.

Next steps

• Cherry-pick to: none / 24.2 / 24.3
• Update sbroad submodule in picodata/picodata.
• (if EBNF grammar is changed) create a follow-up issue in picodata/docs — создам МР в docs после вливания текущего МР