feat(#77)!: remove ApplicationContext and replace it with a new interface for DeferredProvider. (closes #77)

[francescovallone]

Description

Remove ApplicationContext and replace the way to register DeferredProvider to something more straightforward. Also removed DeferredModules and ModuleOptions to simplify the code management.

Fixes #77

Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Attention: Patch coverage is 96.33700% with 10 lines in your changes missing coverage. Please review.

Project coverage is 89.66%. Comparing base (e85a2c8) to head (a62c390).

Files with missing lines	Patch %	Lines
packages/serinus/test/core/provider_test.dart	94.95%	6 Missing ⚠️
...s/serinus/lib/src/containers/module_container.dart	96.33%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #86      +/-   ##
===========================================
+ Coverage    89.29%   89.66%   +0.37%     
===========================================
  Files           74       73       -1     
  Lines         2457     2584     +127     
===========================================
+ Hits          2194     2317     +123     
- Misses         263      267       +4     

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