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

.gitignore

@@ -4,6 +4,7 @@ logs
 node_modules
 /dist
 /webapp/dist
+jobserver
 npm-debug.log
 mattermost.mattermost-license
 config/mattermost.mattermost-license
@@ -16,8 +17,7 @@ config/active.dat
 config/config.json
 
 # Enteprise imports file
-imports.go
-cmd/mattermost/imports.go
+imports/imports.go
 
 # Build Targets
 .prebuild