[Feature]: Add NPLN support

[jonbarrow]

Checked Existing

• I have checked the repository for duplicate issues.

What feature do you want to see added?

Add the ability to handle NPLN packets.

Why do you want to have this feature?

NPLN is Nintendo's modern replacement for NEX. It uses gRPC for server communications rather than WebSockets/UDP.

Any other details to share? (OPTIONAL)

This is not super useful to use right now, but would round out the application. Others might find this useful as well. Protobufs for the current NPLN services can be found here https://github.com/kinnay/NPLN-Protocols