Add method and subpath flags to timetrigger object for triggering a function (#3017)

* Update timetrigger crd and add method and subpath fields in spec.
Update fission-cli to accept user input for method and subpath fields.
Update publisher package to utilize these fields for triggering a function.
Update timer controller to use method and subpath fields for publishing a request.
Add a new test TestPublisherSubpath in pulisher package.

Signed-off-by: Md Soharab Ansari <soharab.ansari@infracloud.io>

* Use kubebuilder default annotation.
Update test for fission-cli timetrigger create, update command to support method and subpath flags.

Signed-off-by: Md Soharab Ansari <soharab.ansari@infracloud.io>

---------

Signed-off-by: Md Soharab Ansari <soharab.ansari@infracloud.io>

pkg/fission-cli/flag/flag.go

@@ -157,6 +157,7 @@ var (
 	TtCron   = Flag{Type: String, Name: flagkey.TtCron, Usage: "Time trigger cron spec with each asterisk representing respectively second, minute, hour, the day of the month, month and day of the week. Also supports readable formats like '@every 5m', '@hourly'"}
 	TtFnName = Flag{Type: String, Name: flagkey.TtFnName, Usage: "Function name"}
 	TtRound  = Flag{Type: Int, Name: flagkey.TtRound, Usage: "Get next N rounds of invocation time", DefaultValue: 1}
+	TtMethod = Flag{Type: String, Name: flagkey.TtMethod, Usage: "HTTP Methods: GET,POST,PUT,DELETE,HEAD."}
 
 	MqtName            = Flag{Type: String, Name: flagkey.MqtName, Usage: "Message queue trigger name"}
 	MqtFnName          = Flag{Type: String, Name: flagkey.MqtFnName, Usage: "Function name"}

pkg/fission-cli/flag/key/key.go

@@ -110,6 +110,7 @@ const (
 	TtCron   = "cron"
 	TtFnName = "function"
 	TtRound  = "round"
+	TtMethod = "method"
 
 	MqtName            = resourceName
 	MqtFnName          = "function"