* wip: add transfer auithorization
* feat: update transferAuthPayload
* switch to MAX_INT for value and use revoke flag
* tranfer handler: fix nonce rollback on EOA account
* feat: switch to session based session transfer auth
* Demurrage contracts require setting the approval value to 0 before updating the value after the initial limit is set
* This implementation auto-revokes every 15 min after arequest is created. Subsequent requests will fail untill the value is set back to 0
* feat: settable approve session timeout
* remove uncessary tasks and task handlers
* reafctor custodial container
* refactor gas refiller. Gas refiller can queue at a later time to match cooldown
* refactor sub handler to process chain events
* fallback to custom ethereum checksum validator -> https://github.com/go-playground/validator/issues/1073
* decouple jetsream emitter to separate package
* refactor task handlers into individual files
* add error handler for echo to capture unexpected errors and log them
* move handler dependencies into single struct container -> custodialContainer
* replace signer to use EIP 1559 signer -> celoutils v1
* Add 1 minutes timeout to all custodial tasks
* closes#32
* bin can now run in full (default), tasker, api mode
* move logg bootstrpping earlier
* config file loading via flag
* rename service to main
* graceful shutdown now in main and dependant on mode
Mohamed Sohail