feat(host): Modular components

[clabby]

Overview

Cleans up some of the duplication in the host by tackling #369. The host's preimage server is now served with generics over the Fetcher + communication Channel. The HostOrchestrator trait allows for creating a custom host program with its own CLI with most of the bootstrapping auto-implemented.

These abstractions are also used in the kona-host binary now, sharing a ton more code between the single-chain and interop modes.

[clabby]

📚 $\text{Stack Overview}$

Pulls submitted in this stack:

• feat(host): Modular components #915 👈
• main

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.1%. Comparing base (c56c3fc) to head (a6258a0).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

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