Upgrade tokio to 1.x

[jolestar]

Tokio 1.x has been released for several months ago, we need to upgrade to 1.x

[niklasad1]

Hey,

The idea is to replace jsonrpc with jsonrpsee which already is using tokio 1.x but the development has taken longer time than expected.
So for now, we are aware of it and working on it.