deck command for config checking and auto-fixes to help in migrations

[Prashansa-K]

This utility can help users to check for lint errors or any deprecated/unsupported config in their deck files and also auto-fix whatever possible. It can be useful for migrations between versions.
Extending deck file convert can also be explored here.

[Prashansa-K]

Internal doc for tracking what configs we will auto-fix is added here along with a sample output: https://konghq.atlassian.net/wiki/spaces/A/pages/4563304450/Configuration+Reference+for+Migration+Utility+2.8+to+3.4

A test binary is shared with the stakeholders involved along with a sample file. Reviews pending.