Client's SendToAddress RPC method is not really sendtoaddress

[roman-khimov]

It should invoke this:
https://docs.neo.org/docs/en-us/reference/rpc/latest-version/api/sendtoaddress.html

But instead it crafts a transaction and makes sendrawtransaction, which actually is good, we should have this functionality too, but it certainly shouldn't be called SendToAddress as external users would expect it to be a wrapper of true sendtoaddress call.