Add configuration file support

[nodece]

Summary

Currently, the casbin-mesh doesn't support the configuration file, we should support this which is important, I create a draft for this:

name:

data-dir:

log:
  level: info
  
bind-address:
  - 192.168.1.10:4001
  - 10.168.1.10:4002

advertise-address: 192.168.1.10:8080

endpoint:
  tls:
    enable: false
    ca:
    key:
    cert:
  authorization:
    enable: false
  authentication:
    enable: false
    type: basic
    params:
      username: root
      password: root

peer:
  tls:
    enable: false
    ca:
    key:
    cert:
  snap-threshol: 10
  snap-interval: 10
  leader-lease-timeout: 0
  heart-beat-timeout: 0
  election-timeout: 0
  apply-timeout: 0
  open-timeout: 0
  wait-leader: false
  shutdown-on-remove: false
  compression-size: 10
  compression-batch: 20

pprof:
  enable: false
  cpu-profile:
  mem-profile:

[casbin-bot]

@WenyXu @nodece

[devajithvs]

Can I work on this issue?

If yes, it'd be great if I can have the following question(s) answered

1. Do you recommend using an external package like ff to parse the configuration file or do you recommend writing code specifically for our use-case?
2. I think commandline arguments must have the highest priority, please correct me if I am wrong.

[WenyXu]

Can I work on this issue?

If yes, it'd be great if I can have the following question(s) answered

1. Do you recommend using an external package like ff to parse the configuration file or do you recommend writing code specifically for our use-case?
2. I think commandline arguments must have the highest priority, please correct me if I am wrong.

Hi, there. You can work on this absolutely, and check this repo which is also helpful.