Add shared node setup / coverage report

[huntharo]

• Add code coverage report to PRs
• Improve code coverage
• Move node setup / module install / caching to shared action

[github-actions]

📊 Node.js Code Coverage Report

File	Lines	Lines Hit / Found	Uncovered Lines	Branches
src/blocking-queue.ts	✅ 97.6%	240 / 246	6	91.9%
src/iterable-mapper.ts	✅ 97.5%	581 / 596	15	90.5%
src/iterable-queue-mapper-simple.ts	✅ 100.0%	156 / 156	0	100.0%
src/iterable-queue-mapper.ts	✅ 100.0%	101 / 101	0	100.0%
src/iterable-queue.ts	✅ 100.0%	43 / 43	0	100.0%
src/queue.ts	✅ 94.3%	33 / 35	2	85.7%
Overall	✅ 98.0%	1154 / 1177	23	92.1%