Associate share with its owner and change authorization process

[ognis1205]

URL desing:

• administrator

  https://sharing.example.org/administrator/

• provider

  https://sharing.example.org/provider/{namespace}/

• recipient

  https://sharing.example.org/recipient/{namespace}/

[ognis1205]

• [x] add role columns
• [x] add description columns
• [ ] follow RFC7519
• [ ] improve URL design
• [x] add activation columns

[ognis1205]

I will work on this.