Refactoring/54 move process from project to document level

[DavidHuebner]

• Processes are now tightly coupled to DocumentCollections
• Methods to handle Processes (get_process, create_and_run_process) have been moved from Project to DocumentCollection.
  • The only method on project level is project.list_processes() which lists all processes over all collections
• This avoids the passing of duplicate parameters and follows the logic of the API endpoint urls which should simplify it for the user
• (Another refactoring): Added String representation of our classes

[codecov-commenter]

Codecov Report

Merging #66 (c3043a4) into dev (318fa9c) will decrease coverage by 0.46%. The diff coverage is 75.86%.

@@            Coverage Diff             @@
##              dev      #66      +/-   ##
==========================================
- Coverage   90.12%   89.66%   -0.47%     
==========================================
  Files          15       15              
  Lines        1388     1403      +15     
==========================================
+ Hits         1251     1258       +7     
- Misses        137      145       +8     

Impacted Files	Coverage Δ
averbis/core/_rest_client.py	83.45% <72.00%> (-0.83%)	:arrow_down:
tests/test_process.py	100.00% <100.00%> (ø)
tests/test_project.py	100.00% <100.00%> (ø)

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