Remove filter phases for now, because those can't be handled efficiently
by the Kong side: one cannot open non-blocking sockets in `header_filter`
and `body_filter` so we avoid those phases when doing Go plugins to avoid
using blocking sockets.
* it runs... something
* use strings for dict keys
* small cleanups / better locking
* add StepXXX RPC methods to express non-primitive PDK return types
* remove commented code
* define recognizable error type
* config schema as a structure, not a string that happens to be decodable
* changed Kong capitalization because of Go
* reread plugin if modified on disk
* docs about event cycle and callback return types
* The standard package can't reload Plugins
* add status report, including some timekeeping
* expire instances after 60sec idle
* a bit of logging
* send PID on status and on connection (as unrequested notification)
