Allow plugins synchronize to workspace

[NickRimmer]

Hoi everyone, I hope you doing well (;

Problem

The import logic was changed after some previous updates (I checked it a few months ago last time). Before, when I export my workspace, then tried to import back, it didn't create any new requests, but now creating.

I see from the code, it starts generating new IDs for requests and groups during the import. What is probably fine, as it really works as importing now. But then we killed the synchronization possibility )=

Solution

Create one more method, to allow plugins old-way import - synchronization to an existing workspace. Additionally, we can make it possible to synchronize environments again, currently it is excluded from the import process.

Pull request with implementation #6078