* luarocks: added new dependencies `lua-resty-healthcheck` and `lua-resty-worker-event`.
* feature(balancer): fetched health node from upstream nodes in balancer phase when enabled
healthcheck.
* feature: supported to generate admin API basic configurations when the admin API is enabled.
* feature: supported to manage route API for admin user, it contains: PUT, GET, DELETE and POST.
* feature: used json schema to check if the request configuration is valid.