Validate all errors

[dmartin35]

@Lawouach This is the first version of global validation for the experiment syntax.

This is appending/extending a list of Exception instances along the validation line and reporting all errors at once, at the end of experiment validation (before raising a global exception that is matched & logged by the CLI)

Improvement, in this version, for each error we create an instance of a sub class of ChaosException. We might simplify to only handle a list of errors messages as strings.

To be continued, if we choose this solution, the hypothesis module still need to be updated

[codecov-io]

Codecov Report

Merging #155 into master will increase coverage by 0.42%. The diff coverage is 84.21%.

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
+ Coverage   86.41%   86.83%   +0.42%     
==========================================
  Files          23       23              
  Lines        1627     1664      +37     
==========================================
+ Hits         1406     1445      +39     
+ Misses        221      219       -2

Impacted Files	Coverage Δ
chaoslib/provider/process.py	92.15% <100%> (+0.66%)	:arrow_up:
chaoslib/exceptions.py	100% <100%> (ø)	:arrow_up:
chaoslib/hypothesis.py	89.1% <100%> (+0.66%)	:arrow_up:
chaoslib/control/python.py	87.5% <100%> (+0.29%)	:arrow_up:
chaoslib/extension.py	84.9% <100%> (+0.59%)	:arrow_up:
chaoslib/control/__init__.py	87.29% <40%> (+0.14%)	:arrow_up:
chaoslib/activity.py	88.48% <65.21%> (+0.89%)	:arrow_up:
chaoslib/provider/http.py	84.9% <85.71%> (+0.59%)	:arrow_up:
chaoslib/experiment.py	91.89% <88.88%> (+0.17%)	:arrow_up:
chaoslib/provider/python.py	87.17% <93.75%> (+0.87%)	:arrow_up:
... and 1 more

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