Since the runtime of the `@medusajs/analytics-posthog` relies on `posthog-node` package. It should be either installed as a dependency or a peerDependency that will be satisfied by the user project.
In this PR, I have added it as a peer dependency
* feat: Add an analytics module and local and posthog providers
* fix: Add tests and wire up in missing places
* fix: Address feedback and add missing module typing
* fix: Address feedback and add missing module typing
---------
Co-authored-by: Adrien de Peretti <adrien.deperetti@gmail.com>
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
