fix(core/cddl): use conforming prose dfn attributes

[aqilaziz]

Closes #5303.

Summary

• Use conforming data-dfn-type / data-dfn-for prose definitions for CDDL prose-level dfns.
• Map generated CDDL ids to the actual prose dfn ids so CDDL blocks link to existing prose definitions without creating duplicate block dfns.
• Update CDDL specs and the W3C build artifact.

Tests

• pnpm exec prettier --check src/core/cddl.js tests/spec/core/cddl-spec.js
• pnpm exec eslint src/core/cddl.js tests/spec/core/cddl-spec.js
• pnpm build:w3c
• $env:BROWSERS='ChromeHeadless'; pnpm exec karma start ./tests/spec/karma.conf.cjs --single-run --grep "Core - CDDL"