chore: improvments around relay

Lots of improvements, mainly related to the relay:

relay now stores account states, thus the UI can refresh and obtain them
relay provides amman version when via a socket.io message to UI to allow checking for compatibility
account states are timestamped
account states include slot so that they can be correlated with transactions
account states include diff so that UI can show changed fields
duplicate labels are fixed except for some edge cases
amman shutdown was improved as well to ensure relay is properly disconnected

metaplex-foundation / amman