* add load_gh_pr_rules function
* add dev package-stats command
* add dev search-rule-prs command, which extends the same functionality in rule-search to rules in PR
* Restructure commands under more specific click groups
* standardize CLI error handling
* add global debug options
* move es and kibana clients into their click groups
* move commands and groups to dedicated files
* distinguish variable names for better env/config parsing