Warn when multiple version of Sentry's JS SDK are used in RN project

[krystofwoldrich]

Description

Sentry RN SDK depends on a specific version of Sentry's JS SDK, but nothing prevents user to install some of the JS packages with different versions.

Installing Sentry JS package is valid use case in monorepos with web apps and also for extending the RN SDK functionality.

But if incorrect version is installed it might lead to unexpected behaviour.

We can check this during bundling process.