[Dev] Add `py::is_operator()` where appropriate for the `DuckDBPyExpression` interface#44

evertlammerts merged 2 commits intoduckdb:v1.4-andiumduckdb/duckdb-python:v1.4-andiumfrom

Tishj:pyexpression_is_operatorTishj/duckdb-python:pyexpression_is_operatorCopy head branch name to clipboard