* agent schema/methods/types/store methods for notifications tokens
* register notification token on the server
* agent commands for notification tokens
* refactor initial servers from AgentConfig
* agent store functions for notification tokens
* server STM store methods for tokens
* fix protocol client for ntfs (use generic handshake), minimal server and agent tests
* server command to verify ntf token
* process ntf server commands
* when subscription is re-created and it was ENDed, resubscribe to SMP
* SMPClientAgent draft
* SMPClientAgent: remove double tracking of subscriptions
* subscriber frame
* PING error now throws error to restart SMPClient for more reliable re-connection (#342)
* increase TCP timeout to 5 sec
* add pragmas and vacuum db (#343)
* vacuum in each connection to enable auto-vacuum (#344)
* update protocol, token verification
* refactor SMPClient to ProtocoClient, to use with notification server protocol
* notification server client, managing notification clients in the agent
* stub for push payload
Co-authored-by: JRoberts <8711996+jr-simplex@users.noreply.github.com>
* notifications: protocol
* update protocol to include subscription ID and DH public key
* update protocol, started server
* add notification server subscription DH key
* use the same command type in notifications protocol, protocol parsing, server frame
* remove empty files
