Make get_module return typed module

[sdb9696]

Passing in a string still works and returns either IotModule or SmartModule type when called on IotDevice or SmartDevice respectively. When calling on Device will return Module type.

Passing in a module type is then typed to that module, i.e.:

smartdev.get_module(FanModule)  # type is FanModule
smartdev.get_module("FanModule")  # type is SmartModule

Only thing this doesn't do is check that you can't pass an IotModule to a SmartDevice.get_module(). However there is a runtime check which will return null if the passed ModuleType is not a subclass of SmartModule.

Many thanks to @cdce8p for helping with this.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.48%. Comparing base (5b48607) to head (bb1492b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #892      +/-   ##
==========================================
+ Coverage   90.31%   90.48%   +0.16%     
==========================================
  Files          70       70              
  Lines        4917     4937      +20     
  Branches     1214     1218       +4     
==========================================
+ Hits         4441     4467      +26     
+ Misses        386      380       -6     
  Partials       90       90              

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[rytilahti]

Looking good and this is much nicer than casting & string access! It'd be great to have tests for the corner cases (i.e., passing invalid module name, passing invalid class, ..) and adding tests to fix those codecov warnings.

[rytilahti]

LGTM, let's get it merged! 🥇