PLT-6408 Framework for job server (#6404)

* Added initial job server

* Added job server to be ran as part of platform

* Added test job to the enterprise repo

* Fixed job server not loading license

* Renamed job package to jobs

* Fixed TE not being buildable

* Added JobStatus table to database

* Changed fields used by JobStatus

* Added APIs to query job status

* Added config change listener to server

* Added option to run job server from Makefile

* Added ability to enable/disable jobs from config

* Commented out placeholder for search indexing job

* Fixed govet

* Removed debug messages and fixed job api init message

einterfaces/jobs/data_retention.go

@@ -0,0 +1,23 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package jobs
+
+import (
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/store"
+)
+
+type DataRetentionInterface interface {
+	MakeJob(store store.Store) model.Job
+}
+
+var theDataRetentionInterface DataRetentionInterface
+
+func RegisterDataRetentionInterface(newInterface DataRetentionInterface) {
+	theDataRetentionInterface = newInterface
+}
+
+func GetDataRetentionInterface() DataRetentionInterface {
+	return theDataRetentionInterface
+}