feat(bin): Network Component Runner

[refcell]

Description

Introduces a small binary in kona that can be used to run different networking components for testing purposes.

Perhaps there's a better place for this bin to live. Happy to move it to someplace like an examples directory or such.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 80 lines in your changes missing coverage. Please review.

Project coverage is 92.1%. Comparing base (161547c) to head (c86ae08).
Report is 4 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
bin/nexus/src/gossip.rs	0.0%	27 Missing ⚠️
bin/nexus/src/telemetry.rs	0.0%	22 Missing ⚠️
bin/nexus/src/disc.rs	0.0%	16 Missing ⚠️
bin/nexus/src/main.rs	0.0%	13 Missing ⚠️
bin/nexus/src/globals.rs	0.0%	2 Missing ⚠️

Additional details and impacted files

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.