XD-1004 Add JobScheduler support

- Add basic template and service
- Add Streams page
- Update stream views/controllers/routes
- Update states/routes
- Pluralize controllers
- Add shared services
  - Rename `XDCommon` to `XDUtils` and move it to shared services
- Move templates to appropriate modules
- Move `views` into appropriate modules' views
- Add scheduler support
  - Add Job scheduler controller/service/templates/routes
  - Add form validations
  - Active/De-activate scheduleJob button
- Restrict button activation based on the valid form fields
- Remove highlightjs styles

Jira: https://jira.spring.io/browse/XD-1004