update(mnesia): Add client ID/username regex

[Meggielqk]

https://emqx.atlassian.net/browse/EMQX-12247

[savonarola]

This part seems to be mostly outdated...
The endpoints are

        "/authorization/sources/built_in_database/rules/users",
        "/authorization/sources/built_in_database/rules/clients",
        "/authorization/sources/built_in_database/rules/users/:username",
        "/authorization/sources/built_in_database/rules/clients/:clientid",
        "/authorization/sources/built_in_database/rules/all"

Also the API directly reflects the dashboard, there are three scopes: username, clientid and all.

To create rules, e.g. for a user, the request is the following:

curl 'http://localhost:18083/api/v5/authorization/sources/built_in_database/rules/users' \
- X POST \
...[headers]... \
  --data-raw '[{"username":"sdfs","rules":[{"topic":"sdfv","permission":"allow","action":"publish","qos":[0,1,2],"retain":"all"}]}]'

To update rules e.g. for a user:

curl 'http://localhost:18083/api/v5/authorization/sources/built_in_database/rules/users/sdfs' \
  -X 'PUT' \
... [headers]... \
  --data-raw '{"username":"sdfs","rules":[{"action":"publish","retain":"all","topic":"sdfvsdf","qos":[0,1,2],"permission":"allow"}]}'

For /authorization/sources/built_in_database/rules/all endpoint there is no PUT request, just POST updating/creating all the rules.

There is no such hing as scope & scope_value 🤔

Also see swagger doc on a running release-60 instance: http://localhost:18083/api-docs/index.html#/Authorization/put_authorization_sources_built_in_database_rules_users__username_