Fix: Refactors createFromKeyBundle swift function to guard string conv

[Jonathansoufer]

This fixes the issue #66 when the app crashes while dealing with non String types on createFromKeyBundle.

Taken Actions:

• Added guard to the function to transfer program control out of scope.
• Added new error enum invalidKeyBundle.
• Returning empty string in case of problems.

How to test it?

• Pass any non string value to createFromKeyBundle func.

[nplasterer]

Thanks so much for doing this!! I think it might be worth writing a test for this error maybe something like the below in this file https://github.com/xmtp/xmtp-react-native/blob/main/example/src/tests.ts . I ran this test below on main and saw the crash and also on your branch and saw it pass so can confirm this fixes it.

import { randomBytes } from "crypto";

test("createFromKeyBundle throws error for non string value", async () => {
  try {
    const bytes = randomBytes(32)
    await XMTP.Client.createFromKeyBundle(JSON.stringify(bytes), "local");
  } catch (e) {
    return true;
  }
  return false;
});

Unfortunately our CI times out 75% of the time so we have to just run the unit tests locally in iOS and Android before merging. But hopefully I can get a fix for that in soon. But just giving you heads up that CI may be red even if its not.

[nplasterer]

This looks great thanks for addressing all my comments!

[github-actions]

🎉 This PR is included in version 1.6.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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