feat: agent sse & scheduler management

[ghkdqhrbals]

• Close #25

Implements

• Common dto module
• Scheduler manage interface and abstract class, impl class
• Separate SSE Handler with multiple clients
• restAPI of agent controller
  • /api/templates/{template_id}?action=start sse endpoint will return TestResult in every seconds

    for now, it will return TestResult's stub

  • /api/templates/{template_id}?action=stop will complete sseEmitter and shutdown related scheduler that has id of {template_id}
• agent server port on 8081, controller server port on 8080

[LeeJeongGi]

이제 그만하고 주무세요,,,,ㅋㅋㅋㅋ

[ghkdqhrbals]

ㅋㅋㅋㅋㅋ 넵!

[github-actions[bot]]

📝 Test code-coverage reports

File	Coverage [100%]	:green_apple:
JsonMapper.java	100%	:green_apple:

Total Project Coverage	88.74%	:green_apple: