Configurable Client ID generator function

[peppelinux]

A custom Client ID generator function can be defined Registration endpoint configuration

• feat: "client_id_generator"
• feat: default client_id length up to 16 digits

    "registration": {
      "path": "registration",
      "class": "oidcop.oidc.registration.Registration",
      "kwargs": {
        "client_authn_method": None,
        "client_secret_expiration_time": 432000,
        "client_id_generator": 'oidcop.oidc.registration.random_client_id'
      }

[rohe]

OK, I'd like that to be:

"registration": {
      "path": "registration",
      "class": "oidcop.oidc.registration.Registration",
      "kwargs": {
        "client_authn_method": None,
        "client_secret_expiration_time": 432000,
        "client_id_generator": { 
           "class": 'oidcop.oidc.registration.random_client_id',
           "kwargs: {}
       }
    }

There is pattern there I'd like to maintain.

[peppelinux]

Done here
5f0e79e

once this feature will be merged I'll updated docs branch with this specification and example