fix: Change call send amount to be an array of Coin

[jefft0]

The gnoclient API uses MsgCall where the send 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). Similar to PR #191 for MsgSend, we want to track the current gnoclient API. This PR has three commits:

1. Update go.mod to use the latest gnokey-mobile. This allows gnonative to compile after updating to the latest gnolang/gno.
2. Change the Protobuf MsgCall to use an array of Coin for the Send amount. (The Protobuf Coin type was already defined.) Run make regenerate to make the native interfaces. Update gnoNativeService.convertCallRequest to use the Coin struct, similar to the previous change to convertSendRequest. Run npm install @gnolang/gnonative to install the new API on buf.build.
3. In expo, update package.json to use the updated bufbuild_es types. Update call and makeCallTx to take an array of Coin.

BREAKING CHANGE: The only code which currently uses the Send amount in MsgCall is where gnokey-mobile calls "Register". After we merge this PR, we will update gnokey-mobile.

[D4ryl00]

LGTM

[github-actions]

🎉 This PR is included in version 4.0.0 🎉

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