resource: make feasibility service registration optional

[grondo]

Problem: There are many cases in the testsuite where the Fluxion resource module is loaded alongside sched-simple for testing, but this currently fails because these two modules now conflict due to the feasibility service.

Since feasibilty is an optional service, and may soon move to a separate module anyway, make feasibility service registration optional.

[grondo]

Thanks! Setting MWP.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.4%. Comparing base (ca046b4) to head (d46d09d).
Report is 74 commits behind head on master.

Files with missing lines	Patch %	Lines
resource/modules/resource_match.cpp	50.0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1281   +/-   ##
======================================
  Coverage    75.4%   75.4%           
======================================
  Files         111     111           
  Lines       15361   15360    -1     
======================================
  Hits        11588   11588           
+ Misses       3773    3772    -1     

Files with missing lines	Coverage Δ
resource/modules/resource_match.cpp	68.8% <50.0%> (+<0.1%)	⬆️

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