[#85] Enhance playground stability and user experience

[danhuawang]

1. add health check: start_period

2. remove resource limit ,add resource requirements in readme

3. improve console output ,persist log file

4. add precheck for ports in use

5. add precheck for docker if works in current user

6. fix Trino unhealthy issue

7. replace folder /user/datastrato to /user/gravitino

8. fix /user/datastrato not exists

9. fix the warning: "MYSQL_ROOT_PASSWORD" is empty string

10. fix the 'version' warning message in console

11. add confirmation for resources requirements

12. change playground usage: ./playground.sh [start | status | stop] [-y]