build: speedup sample app installing local SDK

[levibostian]

When you make an update to the SDK source code and you want to test that change in one of the sample apps, you have to run yarn update customerio-reactnative to force yarn to re-install the local copy of the SDK. This step takes many minutes to run and slows down development.

I used --verbose the last time I ran yarn update... and noticed that mostly why it was taking so long was that yarn was installing and caching the sample apps and all of it's subdirectories. This is what was taking up too much time during install.

So, this refactor uses npm pack to build the SDK with only the files that are needed to install the SDK. We then tell npm to install the CIO SDK from the built .tgz file instead of ../../.

From testing, you can now update the local RN SDK source code in a sample app in ~3 seconds. It used to be between 5-10 minutes for me.

[github-actions[bot]]

Pull request title looks good 👍!

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[levibostian]

Ready for re-review.

Also, I improved the speed from 10 seconds to ~3 seconds.