[jsonrpsee ws]: handle connection reset

[niklasad1]

In some scenarios it's possible that the jsonrpsee WebSocket client terminates the connection and it can't be recovered.

The error message is bad it will be Error::Internal (will improve in the next release), if such occurs subxt should restart it, drop the client and create a new one.

In practice it looks quite difficult because that the RPC client can be configured by the user however at least subxt could pass the error along the user.