start validating workchain inputs

[ltalirz]

fixes #39

Validates parameters input of all WorkChains using voluptuous schemas (both for the keys present and for the type of their values). Validation happens when passing the builder to the WorkChain, i.e. the workchain is not submitted if the dictionary fails validation.

The behavior of the pressure_list and temperature_list keys is modified slightly: if you don't want to provide them, simply don't set the key (instead of setting the key to None).

The schema is part of the API documentation: and users can do print(myworkchain.parameters_info) to check which parameters the workchain needs.

Todo:

• [ ] (optional) introduce line breaks in the docs representation to make it more readable

[ltalirz]

Some details I noticed:

• minor differences in parameter dict keys input between isotherm, isotherm_inflection, isotherm_calc_pe - are they all necessary or can they be harmonized?
• singlecomponent widom calls input temperatures while others call it temperature_list - perhaps user temperature_list everywhere?

[ltalirz]

@danieleongari please check these carefully as not all workchains have tests already... see also the comment above https://github.com/lsmo-epfl/aiida-lsmo/pull/62#issuecomment-732452478

[codecov-io]

Codecov Report

Merging #62 (9e6299a) into develop (8016116) will increase coverage by 0.11%. The diff coverage is 88.29%.

@@             Coverage Diff             @@
##           develop      #62      +/-   ##
===========================================
+ Coverage    76.16%   76.28%   +0.11%     
===========================================
  Files           29       30       +1     
  Lines         2203     2260      +57     
===========================================
+ Hits          1678     1724      +46     
- Misses         525      536      +11     

Impacted Files	Coverage Δ
aiida_lsmo/workchains/isotherm_multi_temp.py	24.19% <0.00%> (ø)
aiida_lsmo/workchains/singlecomp_widom.py	26.47% <66.66%> (+1.72%)	:arrow_up:
aiida_lsmo/utils/other_utilities.py	77.55% <71.42%> (-12.93%)	:arrow_down:
aiida_lsmo/workchains/zeopp_multistage_ddec.py	35.71% <71.42%> (+3.02%)	:arrow_up:
aiida_lsmo/workchains/parameters_schemas.py	81.25% <81.25%> (ø)
aiida_lsmo/utils/__init__.py	100.00% <100.00%> (ø)
aiida_lsmo/workchains/isotherm.py	89.57% <100.00%> (+0.30%)	:arrow_up:
aiida_lsmo/workchains/isotherm_calc_pe.py	45.71% <100.00%> (+5.08%)	:arrow_up:
aiida_lsmo/workchains/isotherm_inflection.py	90.69% <100.00%> (+0.27%)	:arrow_up:
aiida_lsmo/workchains/multicomp_ads_des.py	93.40% <100.00%> (+0.18%)	:arrow_up:
... and 5 more

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