Document Mattermost package Architecture in charter

Display how Mattermost/Mattermost Operator interact with other packages within big bang the product.

Big Bang Package Architecture Review

• Big Bang to Package touchpoints / interractions - does the package have a GUI, storage needs, logging, monitoring, health checks, etc
• HA - What is required for HA
• SSO - does the package have SSO, is it a licensed feature, if not - is there a strategy to provide rudimentary SSO capability vis AuthService?
• Licensing - describe the licensing model and any tiers of capability that are impacted
• Storage - describe any package specific storage or database requirements
• Dependant packages - list any included dependent packages that will not be elevated to a BB Addon