Google Play release promotion

[priitlatt]

In Google Play is is possible to promote a release from one release track to another. For example, one might initially publish the release binary (aab or apk) to be internally tested. Once is tested, then the same version could be promoted to either some broader test track like or directly to production.

This PR introduces new action google-play tracks promote-release to promote release from one track to another.

Example usage:

$ google-play tracks promote-release --package-name "io.codemagic.capybara" --source-track "internal" --target-track "alpha" --release-status "draft"
Promote release 1.0.2 (437) from track "internal" to track "alpha"
Successfully completed release promotion to track alpha
Track: alpha
Releases: [
        Status: draft
        Name: 1.0.2
        Version codes: [
                437
        ]
]

New actions

• google-play tracks promote-release

[helinanever]

Some nits

[helinanever]

One last nit, but overall LGTM