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/cmd/timetrigger/create.go

@@ -116,6 +116,8 @@ func (opts *CreateSubCommand) complete(input cli.Input) (err error) {
 				Type: fv1.FunctionReferenceTypeFunctionName,
 				Name: fnName,
 			},
+			Method:  input.String(flagkey.TtMethod),
+			Subpath: input.String(flagkey.FnSubPath),
 		},
 	}