feat: make Samples property of modifiers optional

[alexander-held]

Systematics and NormFactors previously had a required Samples property to specify on which samples the modifier acts. This makes the property optional, and when not specified the modifier will act on all samples. Also unifies the functionality in the configuration module to avoid duplications due to the features required by #214, including harmonizing the Samples handling for smoothing.

partially addresses #214

breaking changes:

• configuration.sample_affected_by_modifier renamed to configuration.sample_contains_modifier to harmonize naming with configuration.region_contains_sample and the upcoming configuration.region_contains_sample

[codecov]

Codecov Report

Merging #218 (b076f50) into master (d202b5b) will decrease coverage by 0.00%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master     #218      +/-   ##
==========================================
- Coverage   98.26%   98.25%   -0.01%     
==========================================
  Files          15       15              
  Lines        1730     1724       -6     
  Branches      270      268       -2     
==========================================
- Hits         1700     1694       -6     
  Misses         28       28              
  Partials        2        2              

Impacted Files	Coverage Δ
src/cabinetry/workspace.py	84.21% <50.00%> (ø)
src/cabinetry/configuration.py	100.00% <100.00%> (ø)
src/cabinetry/template_postprocessor.py	100.00% <100.00%> (ø)

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