manager: add logger manager

[djshow832]

What problem does this PR solve?

Issue Number: ref #8

Problem Summary:
The logger configuration cannot be updated online now.

What is changed and how it works:
Add a LoggerManager. It watches the configuration modification and then applies the latest configuration.
The encoder cannot be updated online now. It's not easy to implement it and it doesn't deserve the effort.

This PR doesn't actually use LoggerManager. I'll do it in the next PR.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Notable changes

• Has configuration change
• Has HTTP API interfaces change (Don't forget to add the declarative for API)
• Has weirctl change
• Other user behavior changes

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None