refactor: move AspectWatchProtocol to standalone library

[jbedard]

For some experimental importing+usage of this class in binaries supporting the watch protocol. The goal is minimizing actual changes within rules_js so for now the js_run_devserver.mjs is bundled and is almost identical to before.

Changes are visible to end-users: no

Test plan

• Covered by existing test cases

[aspect-workflows]

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Buildifier      Format

[dzbarsky]

@codex please review this

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep it up!

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