Add script for injection Sentry Release

[s1gr1d]

Description

The CLI already supports creating a release, but not injecting one.

There are some Sentry JavaScript SDKs (Next.js, React Router and soon Nuxt) which rather use the Sentry Plugin Manager (which calls the CLI) to inject debug IDs than using the bundler plugins for that. Sometimes it's not possible to add bundler plugins, or the frameworks are exposing build-end hooks, where we can just call the CLI methods at the end of the build.

Release injection currently only works through the bundler plugins (code) and could be added to the CLI as well.

[linear]

CLI-271

[szokeasaurusrex]

I think it may make sense to perform the release injection alongside the debug ID injection, perhaps within the sentry-cli sourcemaps inject command itself.

Does that sound reasonable to you @s1gr1d?

[s1gr1d]

There is the case that people disable everything related to source maps (and therefore debug IDs) and only want to add a release. So it would make sense to have a separate command for that.