feat(#69): allow to pass values to the next function if the middleware closes the request - closes #69

[francescovallone]

Description

Instead of allowing the finalization of the request using the InternalResponse object directly, Serinus will allow to pass a value in the next function and, since the RequestContext has the res property it won't be necessary to pass the InternalResponse object in the use method anymore.

Fixes #69

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 92.30769% with 3 lines in your changes missing coverage. Please review.

Project coverage is 89.75%. Comparing base (4971bb2) to head (66edff8).

Files with missing lines	Patch %	Lines
packages/serinus/test/core/middlewares_test.dart	90.47%	2 Missing ⚠️
packages/serinus/lib/src/core/middleware.dart	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #87      +/-   ##
===========================================
+ Coverage    89.66%   89.75%   +0.08%     
===========================================
  Files           73       73              
  Lines         2584     2605      +21     
===========================================
+ Hits          2317     2338      +21     
  Misses         267      267              

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