Draft: Ark minting with rub test api

https://gitlab.ruhr-uni-bochum.de/FDM/rdm-system/antleaf-projectmanagement/-/issues/20

@anusha This sets up a way to mint arks from within the RUB hyrax app. The main thing created in this PR is a Ruby API for interacting with the rub test server https://ark-test.rd.ruhr-uni-bochum.de . The RubArk class will require some refinement and refactoring I'd imagine and perhaps some additions. A notable thing missing is a method for patching an existing ark.

In crc_datasets_controller.rb the main idea/principle for the hook is set up. The hook should create an ark when a work/experiment is created. It needs changes before going into production; please see comments in the code.

Local (manual) testing example:

• Create new work
• New ark is created on the https://ark-test.rd.ruhr-uni-bochum.de server

Please let me know if you have any questions.

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resources I used below; you may wish to include in repo.

• https://curlconverter.com/ruby/
• https://github.com/oblakeerickson/golds_checkin (MIT)
• https://stackoverflow.com
• https://stackoverflow.com/a/32868560/5101476
• https://stackoverflow.com/questions/13148888/how-to-get-the-current-time-as-13-digit-integer-in-ruby