Add jemalloc feature to force jemalloc as the memory allocator

[hzuo]

This PR adds the rust feature equivalent of: https://duckdb.org/docs/extensions/jemalloc.html

Feel free to re-run upgrade.sh from your own machine to re-build duckdb.tar.gz and bindgen_bundled_versions.rs in case you're worried about any dev env discrepancies.

[shuoli84]

Hi all, is there any chance this pr get merged?