Fixes #672.

Summary

• Generate the @cycle/time/rxjs and @cycle/time/most root entrypoint shims during the package build.
• Include the generated JS and declaration shims in the published package file list.
• Point the root shims at the compiled CommonJS files instead of unpublished src files.

Verification

• npx --yes pnpm@7.33.7 install --frozen-lockfile
• npx --yes pnpm@7.33.7 --filter @cycle/run run build
• npx --yes pnpm@7.33.7 --filter @cycle/dom run build
• npx --yes pnpm@7.33.7 --filter @cycle/time run build
• node -e "const rx = require('./time/rxjs'); const most = require('./time/most'); if (typeof rx.mockTimeSource !== 'function') throw new Error('missing rxjs mockTimeSource'); if (typeof rx.timeDriver !== 'function') throw new Error('missing rxjs timeDriver'); if (typeof most.mockTimeSource !== 'function') throw new Error('missing most mockTimeSource'); if (typeof most.timeDriver !== 'function') throw new Error('missing most timeDriver'); console.log('package-path subpath shims ok');"
• npm pack --dry-run --json | node -e "...assert required files are present..."
• Extracted the packed tarball and required package/rxjs and package/most
• npx --yes pnpm@7.33.7 --filter @cycle/time run lint
• ./node_modules/.bin/prettier --list-different time/.scripts/make-entrypoints.js time/package.json
• git diff --check
• npx --yes pnpm@7.33.7 --filter @cycle/time run test