* zk-token-sdk: add multi-thread for discrete log
* zk-token-sdk: some clean-up
* zk-token-sdk: change default discrete log thread to 1
* zk-token-sdk: allow discrete log thread nums to be chosen as param
* zk-token-sdk: join discrete log threads
* zk-token-sdk: join thread handles before returning
* zk-token-sdk: Apply suggestions from code review
Co-authored-by: Michael Vines <mvines@gmail.com>
* zk-token-sdk: update tests to use num_threads
* zk-token-sdk: simplify discrete log by removing mpsc and just using join
* zk-token-sdk: minor
Co-authored-by: Michael Vines <mvines@gmail.com>