Added create_database() and remove_database() methods.

[jesper-friis]

Closes #34
Closes #38

Add support for backends that supports multiple databases, like stardog and graphdb

[codecov-commenter]

Codecov Report

Base: 73.57% // Head: 73.10% // Decreases project coverage by -0.47% ⚠️

Coverage data is based on head (355eb28) compared to base (95f1d4c).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
- Coverage   73.57%   73.10%   -0.48%     
==========================================
  Files          10       10              
  Lines         598      621      +23     
==========================================
+ Hits          440      454      +14     
- Misses        158      167       +9     

Impacted Files	Coverage Δ
tripper/backends/ontopy.py	37.93% <ø> (ø)
tripper/backends/rdflib.py	96.55% <ø> (ø)
tripper/triplestore.py	77.77% <66.66%> (-1.93%)	⬇️

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[CasperWA]

I think we need to come up with a better way of updating/changing the initialization interface for the backends. Adding an unused parameter to all of them whenever one changes seems extremely inefficient.

[xAlessandroC]

To me, the changes are fine. Since I still have to start the integration with OntoREC, do you need more proper code testing for the final merge of these features?

I also share Casper's point, maybe this approach won't scale in the future.

[jesper-friis]

To me, the changes are fine. Since I still have to start the integration with OntoREC, do you need more proper code testing for the final merge of these features?

I also share Casper's point, maybe this approach won't scale in the future.

OK, I removed the explicit explicit database argument from Triplestore.init()

[CasperWA]

To me, the changes are fine. Since I still have to start the integration with OntoREC, do you need more proper code testing for the final merge of these features?
I also share Casper's point, maybe this approach won't scale in the future.

OK, I removed the explicit explicit database argument from Triplestore.init()

I don't think this was the point. The point was to design a replacement interface and procedure of handling this. This issue is not one that is to be solved in this PR, but rather a new issue should be opened and this interface and procedure should be updated in another PR.

[jesper-friis]

I don't think this was the point. The point was to design a replacement interface and procedure of handling this. This issue is not one that is to be solved in this PR, but rather a new issue should be opened and this interface and procedure should be updated in another PR.

This PR provides a common API for backends with multiple databases. It does not require anything change in code in backends that doesn't support multiple databases.