refactor: refactor configuration file

[Kree0]

refactor: refactor configuration file
feat: add environmrnt variable override to configuration file

Now configuration priority:

1. specified arguments
2. environment variable
3. specified configuration file
4. /etc/cnosdb/cnosdb.conf
5. $HOME/cnosdb/cnosdb.conf
6. default configuration

Required checklist

• Sample config files updated (config,meta/config and default config)
• If there are user-facing changes, the documentation needs to be updated prior to approving the PR( Link )
• If there are any breaking changes to public APIs, please add the api change label.
• Signed CLA (if not already signed)

Which issue does this PR close?

#1410
#1689

Rationale for this change

Are there any user-facing changes?

[zipper-meng]

There are some differences from #1689 about the configuration, could you please explain it on this issue, or add a comment about your design on issue #1689?

[zipper-meng]

I's Ok.