[Deliverable] Edge Mode in Nwaku

[chair28980]

Owner: nwaku

Feature: status-go

FURPS:

• F2. Nwaku is the used Waku implementation for light mode.
• S3. Light mode is supported.

Feature: nwaku

FURPS:

• S6. libwaku support edge node functionalities.

Checklist:

• Specs: link to specs and/or API definition
• Code: link to GitHub issues/PRs/Epic
• Dogfood: link to dogfooding session/artefact
• Docs: links to README.md or docs.waku.org (TBD)