This feature adds the capability to stop unregistered running instances upon startup.
Previously, you had to stop running instances manually or issue an initial request that will shut down instances afterwards.
With this change, all discovered instances will be shutdown. They need to be registered using labels. E.g.: sablier.enable=true
Fixes#153
* feat(plugin): add `proxywasm` plugin
The `proxywasm` plugin is a WASM Filter following the ProxyWasm ABI Specification using the proxywasm go sdk
This allows extensibility with any reverse proxy who implements the ProxyWasm ABI Specification.
The current WASM Filter was successfully tested with APISIX, Envoy, Nginx with ngx_wasm_module from Kong and Istio.
Fixes#145
