Refactor downloadBundleUri to Simplify Nested Conditionals and Improve Async/Await Usage

[BangDori]

First of all, thank you for creating this library!

• https://github.com/vantuan88291/react-native-ota-hot-update/blob/main/src/index.tsx#L114-L140

Currently, the downloadBundleUri function contains multiple nested if-else statements within a try block, making the logic difficult to follow and maintain. I propose to enhance error handling and overall code readability by using early returns and applying a consistent async/await pattern. May I proceed with this work?

[vantuan88291]

Sure, it great to create a PR. Thanks

[BangDori]

@vantuan88291

I've added the work for this issue to #57!