Issue 369 reestructure spidermon contrib monitors

[kennyaires]

• Split spidermon/contrib/scrapy/monitors.py's content into different submodules
• Create a spidermon/contrib/scrapy/monitors/ folder
• Create an init.py file inside that folder that imports everything from the submodules for backward compatibility
• Create submodules inside spidermon/contrib/scrapy/monitors/
• Update the docs sections so they import everything from the submodules instead of specifying individual classes out of spidermon/contrib/scrapy/monitors.py

[codecov]

Codecov Report

Base: 75.93% // Head: 76.00% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (71af654) compared to base (7766fad).
Patch coverage: 94.11% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #386      +/-   ##
==========================================
+ Coverage   75.93%   76.00%   +0.06%     
==========================================
  Files          73       76       +3     
  Lines        3179     3188       +9     
  Branches      376      376              
==========================================
+ Hits         2414     2423       +9     
  Misses        695      695              
  Partials       70       70              

Impacted Files	Coverage Δ
spidermon/contrib/scrapy/monitors/base.py	92.30% <92.30%> (ø)
spidermon/contrib/scrapy/monitors/__init__.py	100.00% <100.00%> (ø)
spidermon/contrib/scrapy/monitors/monitors.py	97.84% <100.00%> (ø)
spidermon/contrib/scrapy/monitors/suites.py	100.00% <100.00%> (ø)

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[kennyaires]

Hi guys,

I made the changes accordingly, please review.

[kennyaires]

Synced with master, ready to merge.

[VMRuiz]

Please update the PR to work with latest changes in master branch

[kennyaires]

synced with master

[VMRuiz]

I tested it locally and it seems to work fine with both old and new paths. Merging it now.