Add canonical URL generator

[vvasiloi]

Fixes #73

[codecov]

Codecov Report

Attention: Patch coverage is 31.57895% with 26 lines in your changes missing coverage. Please review.

Project coverage is 32.63%. Comparing base (d0a7063) to head (af676a6).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
.../EventSubscriber/Search/CanonicalUrlSubscriber.php	0.00%	13 Missing ⚠️
src/Controller/Action/SearchAction.php	0.00%	8 Missing ⚠️
src/Event/Search/SearchResponseCreated.php	0.00%	2 Missing ⚠️
src/Form/Builder/RangeFilterFormBuilder.php	0.00%	2 Missing ⚠️
src/UrlGenerator/CanonicalUrlGenerator.php	91.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #82      +/-   ##
============================================
- Coverage     32.69%   32.63%   -0.07%     
- Complexity      660      668       +8     
============================================
  Files           124      127       +3     
  Lines          2205     2237      +32     
============================================
+ Hits            721      730       +9     
- Misses         1484     1507      +23     

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[loevgaard]

What were your thoughts with the array $parameters = [] argument?

[vvasiloi]

It allows the user to customise the URL generation. For example, you could pass some query parameters you want to keep.

[vvasiloi]

One could decorate the generator, do some shenanigans with the query parameters to build a parameters array and pass it to the inner generator.

[vvasiloi]

I just added a test case for it.