Tenant management and authentication

[chunshao90]

Describe This Problem

Tenant management and authentication.

Proposal

Simple solution

• [ ] config files, something like

  
  [server.auth]
  enable = true
  # available values: file/ceresmeta
  source = "file"

[server.auth.file] username = "admin" password = "secret-token"

#### Complex
- [ ] `ceresmeta` supports creating tenants and generating tokens.
- [ ] `ceresdb` supports identity verification.

### Additional Context

_No response_

[jiacai2050]

Besides store tenants in ceresmeta, we should also support this via config files

• https://github.com/CeresDB/ceresdb/issues/1016#issuecomment-1605831993

[jiacai2050]

https://www.postgresql.org/docs/current/sql-createrole.html

PG will store password according to https://www.postgresql.org/docs/current/runtime-config-connection.html#GUC-PASSWORD-ENCRYPTION, and users can't get original password.

[jiacai2050]

For gRPC, we can use Bearer auth

• https://github.com/hyperium/tonic/blob/master/examples/src/authentication/client.rs