[Gradle Plugin] linking: If we can't find the sentry cocoa framework, download the framework as a last effort fallback

[buenaflor]

Description

For SPM we try to find the path to the framework and setup linking but if after everything we've tried we cannot find the framework, let's download it and put it into the build dir as a final fallback

We can download the framework through github releases

[buenaflor]

Maybe it makes sense to bundle the SDK with the gradle plugin similar to how AGP does it with sentry-cli