chore: Add Send to the API

[jefft0]

The gnoclient API was updated to add support for MsgSend, so this PR adds Send to the gRPC API:

• Update go.mod to get the latest gnolang/gno.
• In gnonativetypes.go, add MsgSend, SendRequest and SendResponse.
• In rpc.proto, add Send.
• Run make regenerate .
• Copy api/gen/es/gnonativetypes_pb.* and api/gen/es/rpc_connect.* to gnoboard and hello projects.
• In api.go, add Send.
• In all the copies of "use-gno", add send .

I tested this in the goclient example. And I tested it in the gnoboard example with the following code:

    const toAddress = await gno.addressFromBech32("g1juz2yxmdsa6audkp6ep9vfv80c8p5u76e03vvh");
    const send = "1000ugnot";
    const gasFee = '1000000ugnot';
    const gasWanted = 2000000;
    try {
      for await (const response of await gno.send(toAddress, send, gasFee, gasWanted)) {
      }
    } catch (error) {
      console.log(error);
      setAppConsole('error' + JSON.stringify(error));
    }

[D4ryl00]

use-gno lost the ability to send multiple messages at once. For now, we don't have the use case for that, but some other projects can have it. Maybe we should provide the feature now?

[jefft0]

Yes we can. use-gno is supposed to simplify the interface. Supporting multiple messages needs an extra structure and is a little more complicated. Should it be a separate function like sendMulti ?

[D4ryl00]

Ok, we can skip that for now and reconsider the question when needed.

[D4ryl00]

LGTM