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

app/job.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"github.com/mattermost/platform/model"
+)
+
+func GetJobStatus(id string) (*model.JobStatus, *model.AppError) {
+	if result := <-Srv.Store.JobStatus().Get(id); result.Err != nil {
+		return nil, result.Err
+	} else {
+		return result.Data.(*model.JobStatus), nil
+	}
+}
+
+func GetJobStatusesByTypePage(jobType string, page int, perPage int) ([]*model.JobStatus, *model.AppError) {
+	return GetJobStatusesByType(jobType, page*perPage, perPage)
+}
+
+func GetJobStatusesByType(jobType string, offset int, limit int) ([]*model.JobStatus, *model.AppError) {
+	if result := <-Srv.Store.JobStatus().GetAllByTypePage(jobType, offset, limit); result.Err != nil {
+		return nil, result.Err
+	} else {
+		return result.Data.([]*model.JobStatus), nil
+	}
+}