Draft: TangoGQL metrics and health status

Description

TangoGQL provides metrics and health status info

Motivation

Provide health status to Taranta

Fixes:

• Items added

Changes:

• changes made

Tests included/Docs Updated?

• Included for each change/fix?
• Passing? (Merge will not be approved unless this is checked)
• Docs updated?
• New packages used/requires npm install?
• Toggle added for new features?