UI - Group roles by tags

[abvaidya]

Today, domain home page allows grouping of roles by static prefixes by means of configuration.

https://github.com/AthenZ/athenz/blob/master/ui/src/config/default-config.js

allPrefixes: [
            {
                name: 'AWS',
                prefix: ':role.aws',
            },
           {
                name: 'Kubernetes',
                prefix: ':role.k8s',
            },
]

so with above configuration, roles with names aws.fed.admin.user, aws.fed.power.user will be grouped under name "AWS", and roles with names k8s.dev, k8s.admin will be grouped together. ( role is a standard prefix for role entity in Athenz )

This issue is created to add a new feature to allow users group their roles dynamically using role tags. Roles with all tags with same value will be grouped together in the UI.

e.g role1 has tag environment=dev, role2 has tag environment=prod and role3 has tag environment=dev, if user wants to group role by "environment" tag, then role1 and role3 will be grouped together.

Expectations:

• New code and corresponding unit tests with 100% code coverage