SRV-762 feat - firing resizing event

[nyohasstium]

SUMMARY

feat(dashboard): sending resizing events to parent

TESTING INSTRUCTIONS

By running something like

    function handleMessage(event) {
        console.log(event.data.event) 
    }

    window.addEventListener('message', handleMessage, false);

the message can be consumed and applied any actions.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API