Optional query parameters in Seaside REST

[jbrichau]

Add optional query parameters to the routing definitions in Seaside REST.

Before this possibility, any query parameter that can be present in the request MUST be in some route declaration's path specification. When multiple optional query parameters are possible for the same path, it becomes very impractical to specify all possible path specifications.

This PR introduces optional query parameters.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.92%. Comparing base (1935560) to head (6b67dff).
⚠️ Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
...Builder.class/instance/optionalQueryParameters..st	0.00%	5 Missing ⚠️
...agmaStubHandler.class/instance/getAllDocuments..st	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1486      +/-   ##
==========================================
+ Coverage   51.90%   51.92%   +0.01%     
==========================================
  Files        9175     9178       +3     
  Lines       76836    76874      +38     
==========================================
+ Hits        39884    39916      +32     
- Misses      36952    36958       +6     

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