move init schema logic to task service

[w-zr]

What type of PR is this?

• [ ] API-change
• [ ] BUG
• [ ] Improvement
• [ ] Documentation
• [ ] Feature
• [ ] Test and CI
• [x] Code Refactoring

Which issue(s) this PR fixes:

issue #

What this PR does / why we need it:

This PR moves initial schema logic to task service. HAKeeper is responsible for create init schema task and taskRunners(CNs) will run these tasks automatically.

Since task service is currently not fully functioning, this PR may have some problems.