Avoid explicitly naming the meta file

[kubukoz]

Just an experiment for now. Related to #1517

PR Checklist (not all items are relevant to all PRs)

• Added unit-tests (for runtime code)
• Added bootstrapped code + smoke tests (when the rendering logic is modified)
• Added build-plugins integration tests (when reflection loading is required at codegen-time)
• Added alloy compliance tests (when simpleRestJson protocol behaviour is expanded/updated)
• Updated dynamic module to match generated-code behaviour
• Added documentation
• Updated changelog

[kubukoz]

ok, I see. We're not doing this for a valid reason: we'd have to publish the protocol module every time we wanted to load a model. That might slow down the build, and just make for worse UX.