0.20.0

• Make COUNT() aggregation argument to be Option<Any>.
• Replace lazy_static crate by std::sync::OnceLock.
• Migrate to gix 0.63.0.
• Fix hidden selection in group by statement.
• Implement GROUP_CONCAT Aggregation function.
• Catching function argument with undefined type.
• Update Regex expression implementation to not converted to call.
• Introduce gitql-core and gitql-std to allow dynamic std.
• Implement BIN Text function.
• Implement bool_and and bool_or aggregation functions.

Full Changelog: 0.19.1...0.20.0