Add capabilities for automating app store submission

[woodcockjosh]

Adds the following capabilities:

• Attach build to app store version
• Ensure app store version exists
• Create app store version
• Submit app store version for review
• Get app store version ID
• Get build ID
• Get build status
• Wait for build processing to complete
• Add build to external beta testing group
• Notify external beta testing group about new build
• Set version localizations
• Set version review details
• Set release type during submission for review
• Update version attributes during submission for review
• Create external beta testing groups
• Get external beta testing groups by group name

[woodcockjosh]

Also can you also make me a repository owner after you merge since most of the code has now been written by me? Thanks

[nohira]

I just looked at your contribution, it would be nice to have get it merged, there is a lot of work. I'm currently making automation of uploading on stores for both Android and iOS, and it will greatly help to have it. 😃

[anapitupulu]

@woodcockjosh if most of the code has been rewritten, why not create a new repo so you can have a better control of it? I am looking forward for this PR to get merged but it seems like the owner of this repo isn't very prompt to review PRs.