Implement management of rule triggers

[lubomirw]

• add Triggers menu item under Workflows main menu item
• implement listing page - name, triggerResource, triggerType, eventName, description columns
• implement create/edit page using filter widget component to add new actions + dropdown to multiselect from existing rules and action groups. Form can be splitted to 3 sections (blocks):
  • name, description, triggerType and trigger resource to select. In case of selecting trigger type event, load available events for trigger resource from API GET /v1/resources/{resource}/events
  • Rules
  • Actions - to select from action groups + add new actions
  • if Ignore action is added, it should be only action in trigger
• implement simple detail page with delete operation