feat(node): Auto discovery only returns integrations where dependency loads

[timfish]

The current auto discovery returns all integrations and they only become disables when setupOnce is called.

This means all the integrations are retained by the client and listed in sent envelopes.

This PR:

• Adds LazyLoadedIntegration which adds a loadDependency method that allows us to preemptively load the dependency and check whether we should return the integration
• Modifies the auto discovered integrations to implement LazyLoadedIntegration