Reduce routes memory footprint

[Baptouuuu]

Instead of using a lazy Sequence from the start, that creates a new generator for each new route, a lazy Sequence built from the in memory one is built just before calling each handler.

This way handlers declared after the matched route are still not called, while using a single array to store all the callables (instead of n generators).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.51%. Comparing base (c215097) to head (3016ec5).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #25      +/-   ##
=============================================
+ Coverage      94.50%   95.51%   +1.01%     
  Complexity       129      129              
=============================================
  Files             14       14              
  Lines           1583     1583              
=============================================
+ Hits            1496     1512      +16     
+ Misses            87       71      -16     

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