Add events api to shim

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

shim/process.go

@@ -1,18 +1,10 @@
 package shim
 
-import (
-	"context"
-
-	runc "github.com/crosbymichael/go-runc"
-)
+import runc "github.com/crosbymichael/go-runc"
 
 type process interface {
 	// Pid returns the pid for the process
 	Pid() int
-	// Start starts the user's defined process inside
-	Start(context.Context) error
-	// Delete deletes the process and closes all open pipes
-	Delete(context.Context) error
 	// Resize resizes the process console
 	Resize(ws runc.WinSize) error
 	// Exited sets the exit status for the process