Add Modular Watch and Read method (Like Provider)

[jacobaraujo7]

GOAL:

• Methods similar to Provider to facilitate possible migration between the two packages. For this, it will be necessary to add the reading of binds also via BuildContext [context.read()] and watch the changes [context.watch()];

• Add context.read() method by extension.

• Create InheritedWidget for register by context.dependOnInheritedWidgetOfExactType.

• Add context.watch() method by extension.

• Add tests

• Add Dartdocs

• Update official documentation

[codecov]

Codecov Report

Merging #617 (41d89ca) into master (3e5b530) will decrease coverage by 5.25%.
The diff coverage is 19.23%.

❗ Current head 41d89ca differs from pull request most recent head a6b85cb. Consider uploading reports for the commit a6b85cb to get more accurate results

@@             Coverage Diff             @@
##            master     #617      +/-   ##
===========================================
- Coverage   100.00%   94.74%   -5.26%     
===========================================
  Files           32       32              
  Lines          751      799      +48     
===========================================
+ Hits           751      757       +6     
- Misses           0       42      +42     

Impacted Files	Coverage Δ
...modular/lib/src/presenter/widgets/modular_app.dart	40.84% <19.23%> (-59.16%)	⬇️

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