fix: In MsgSend, use Coin. Add expo API function makeSendTx

[jefft0]

The gnoclient API uses MsgSend where the amount is an array of Coin. A Coin is a struct with separate fields for Denom and Amount. However, the Gno Native Kit API uses a string such as "1000ugnot" (from the original version of gnoclient). We want to track the current gnoclient API. This PR has four commits:

1. Change the Protobuf MsgSend to use an array of Coin for the Amount. (The Protobuf Coin type was already defined.) Run make regenerate to make the native interfaces. Update gnoNativeService.Send to use the Coin struct. Run npm install @gnolang/gnonative to install the new API on buf.build.
2. In expo, update package.json to use the updated bufbuild_es types. Update send to take an array of Coin.
3. In expo, for making individual transactions we already have makeCallTx. Add makeSendTx.
4. In expo, in makeCallTx and makeSendTx, the callerAddress should not be optional. (This should have been fixed for makeCallTx in PR fix: Remove deprecated API methods. Require caller address. #184 .)

This was tested by making a local expo NPM package and installing locally in Gnokey Mobile. The following test code sends 100 ugnot to an address.

      const test_addr = await gnonative.addressFromBech32("g1jg8mtutu9khhfwc4nxmuhcpftf0pajdhfvsqf5");
      const tx = await gnonative.makeSendTx(test_addr, [new Coin({denom: "ugnot", amount: BigInt(100)})], "1ugnot", BigInt(10000000), keyInfo.address);
      const signedTx = await gnonative.signTx(tx.txJson, keyInfo.address);
      await gnonative.broadcastTxCommit(signedTx.signedTxJson);

[D4ryl00]

LGTM

[github-actions]

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