Description

Currently we only have extensions meant for production. There is no way to have extensions with scope "test".

With the recent discussion about the MockServer extension which is only for testing, we have to to introduce the logic to allow it.

Implementation ideas

• We need some metadata to mark them as for "test"
• We need the codestart logic to allow extensions with scope "test"
• They could be categorized in a new "Testing" category.