feat: fatal exit upon loss of connection to sequencer

[anomit]

This is a hotfix that ensures the local collector exits cleanly and is brought back up by a docker compose restart policy of the snapshotter node with which it is bundled.

Checklist

• My branch is up-to-date with upstream/main branch.
• Everything works and tested for major version of Python/NodeJS/Go and above.
• I ran pre-commit checks against my changes.
• I've written tests against my changes and all the current present tests are passing.

Current behaviour

Currently the local collector has difficulty establishing a single TCP connection to the sequencer during times of network congestion, which causes further issues with multiplexing libp2p streams on to it.

New expected behaviour

As described in first section of issue description.

Change logs

Changed

• exit on loss of connection to sequencer

Deployment Instructions

NA