handle oai response with workspace clone

[M3ssman]

New Feature to enable workspace creation from OAI-Responses.
See #539 for details.

[codecov-commenter]

Codecov Report

Merging #581 into master will increase coverage by 0.10%.
The diff coverage is 93.93%.

@@            Coverage Diff             @@
##           master     #581      +/-   ##
==========================================
+ Coverage   84.60%   84.71%   +0.10%     
==========================================
  Files          49       49              
  Lines        2813     2845      +32     
  Branches      550      554       +4     
==========================================
+ Hits         2380     2410      +30     
- Misses        332      333       +1     
- Partials      101      102       +1     

Impacted Files	Coverage Δ
ocrd/ocrd/cli/workspace.py	76.47% <ø> (ø)
ocrd_models/ocrd_models/utils.py	94.28% <93.10%> (-5.72%)	⬇️
ocrd/ocrd/resolver.py	96.66% <100.00%> (+0.11%)	⬆️

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[kba]

LGTM, thank you very much. I like how concisely you implemented this and I've learned about pytest/unittest features I haven't used yet but will in the future.

I have refactored a few things and from my POV this can be merged.

However, I would really like to see some tests with real-world OAI-PMH endpoints to make sure the solution is robust enough. @wrznr @mikegerber can you try this and give short feedback whether this PR fits your use case?

[kba]

I've tested this with a few samples provided by @wrznr @maria-federbusch and @cneud from OAI-PMH endpoints at @slub and @StaatsBibliothekBerlin and they all work flawlessly

[mikegerber]

However, I would really like to see some tests with real-world OAI-PMH endpoints to make sure the solution is robust enough. @wrznr @mikegerber can you try this and give short feedback whether this PR fits your use case?

Sorry for not replying earlier: It's working fine 👍 (The METS needs more massaging after that, i.e. #544, but that's a different issue.)