Re-architect zum

[daleal]

Chore: Re-architect zum

Description

This Pull Request re-writes almost the whole codebase to be a bit more flexible. This is by no means a clean version of the library yet, but it is now quite a bit more structured compared to how it was written before.

Requirements

None.

Additional changes

Some classes were renamed (for example, Executor is now called Engine). Now the engine saves a state that can be retrieved, instead of directly printing the output to the console.

[codecov-io]

Codecov Report

Merging #2 (62fa4de) into master (52c5dcd) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master      #2   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           8      11    +3     
  Lines         102     131   +29     
======================================
- Misses        102     131   +29     

Impacted Files	Coverage Δ
zum/cli.py	0.00% <0.00%> (ø)
zum/configs/core.py	0.00% <0.00%> (ø)
zum/configs/errors.py	0.00% <0.00%> (ø)
zum/constants.py	0.00% <0.00%> (ø)
zum/engine.py	0.00% <0.00%> (ø)
zum/executor.py	0.00% <0.00%> (ø)
zum/requests/core.py	0.00% <0.00%> (ø)
zum/requests/errors.py	0.00% <0.00%> (ø)
zum/requests/models.py	0.00% <0.00%> (ø)
zum/requests/validations.py	0.00% <0.00%> (ø)
... and 9 more

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