Refactor runner

[andreab1997]

We want to massively simplify runnner.py:

• In get_output we want to avoid the rotations: if needed they should be done afterwards.
• In __init__ we just need to skip the last part in which targetpids, inputpids, targetgrid and inputgrid are collected.
  @felixhekhorn @alecandido

[codecov-commenter]

Codecov Report

Merging #159 (bd846e2) into develop (e3466fa) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #159      +/-   ##
===========================================
- Coverage    99.95%   99.95%   -0.01%     
===========================================
  Files           97       97              
  Lines         4519     4496      -23     
===========================================
- Hits          4517     4494      -23     
  Misses           2        2              

Flag	Coverage Δ
isobench	54.53% <100.00%> (-0.10%)	⬇️
unittests	99.95% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/eko/runner.py	100.00% <100.00%> (ø)

[alecandido]

In get_output we want to avoid the rotations: if needed they should be done afterwards.

In particular, in get_output only the basic three lines of computation and return will survive, keeping it minimal.

In any case, this runner will be completely reworked in the context of #138

[andreab1997]

This should be ok now, we just need to fix the tests. Before doing that, can you confirm that this is what we want? @felixhekhorn @alecandido

[alecandido]

This should be ok now, we just need to fix the tests. Before doing that, can you confirm that this is what we want? @felixhekhorn @alecandido

Yep, I confirm :)

[andreab1997]

I am merging, thanks for this :)