Update stainless config: fork, instance stats (#122)

* Add fork endpoint to stainless

* Add more missing sdk

Author: sjmiller609

stainless.yaml

@@ -71,17 +71,20 @@ resources:
       port_mapping: "#/components/schemas/PortMapping"
       instance: "#/components/schemas/Instance"
       path_info: "#/components/schemas/PathInfo"
+      instance_stats: "#/components/schemas/InstanceStats"
     methods:
       list: get /instances
       create: post /instances
       get: get /instances/{id}
       delete: delete /instances/{id}
       standby: post /instances/{id}/standby
       restore: post /instances/{id}/restore
+      fork: post /instances/{id}/fork
       start: post /instances/{id}/start
       stop: post /instances/{id}/stop
       logs: get /instances/{id}/logs
       stat: get /instances/{id}/stat
+      stats: get /instances/{id}/stats
     # Subresources define resources that are nested within another for more powerful
     # logical groupings, e.g. `cards.payments`.
     subresources: