Allow multiple users to edit / upload extension data

Problem to solve

As a team of maintainers of an extension, I like to edit / upload extension data with my personal login

Further details

We want to avoid accounts, which needs to be shared between persons, so each typo3.org should be bound to a person. But in case of extension development, often more then one persons updates extensions.

Proposal

• Allow more than one extension author: Every author (with a linked typo3.org account) is allowed to upload / edit extension data
• Add owner info: one typo3.org is the owner, which is allowed to add / remove authors and manage the key

Acceptence Criterias

• Authors can upload / edit metadata
• Owner can can / remove authors