feat: Keystone

[gbarkhatov]

Adds a support for the Keystone HW wallet

Closes #10

Problem 1:

When running npm link to test out on simple-staking we have issues related to the default exports.

import sdk, { PlayStatus, ReadStatus, SDK, SupportedResult } from "@keystonehq/sdk";

if (sdk?.bootstrap) {
  sdk.bootstrap();
  this.viewSdk = sdk;
} else {
  // commonjs -> esm npm link issue
  (sdk as any).default.bootstrap();
  this.viewSdk = (sdk as any).default;
}

So in storybook sdk is defined and has sdk.bootstrap. While in simple-staking you have to access sdk.default.bootstrap. We either solve this:

• via Keystone side and named export in their @keystonehq/sdk (already requested)
• on our side by playing around with vite on bbn-wallet-connect or simple-staking

@totraev @supertong any ideas?

Problem 2:

To use Keystone, we need to implement signMessage with ecdsa. The BIP322 implementation is already there, but we don't care about it on our current tech stack. It is also not implemented in Tomo wallet connector.

[jrwbabylonlab]

LGTM