Let response sender return an Attempt<SideEffect>

[Baptouuuu]

This will allow code relying on Sender to better handle errors and allow for lazy execution.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.77%. Comparing base (141a7cd) to head (d598be0).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/ResponseSender.php	0.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #13      +/-   ##
=============================================
- Coverage      95.79%   95.77%   -0.02%     
  Complexity      1278     1278              
=============================================
  Files            260      260              
  Lines           5535     5536       +1     
=============================================
  Hits            5302     5302              
- Misses           233      234       +1     

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