Add convenience function FormatterOptions::fieldsContain()

[greg-1-anderson]

Overview

This pull request:

• [ ] Fixes a bug
• [x] Adds a feature
• [ ] Breaks backwards compatibility
• [x] Has tests that cover changes

Summary

Adds a convenience method FormatterOptions::fieldsContain() so that callers may determine if a certain field will be included in the output, e.g. so that they can omit calculating slow fields if they were not requested.

[codecov[bot]]

Codecov Report

Merging #105 (0f77805) into 4.x (973242e) will increase coverage by 0.08%. The diff coverage is 85.71%.

:exclamation: Current head 0f77805 differs from pull request most recent head 1780361. Consider uploading reports for the commit 1780361 to get more accurate results

@@             Coverage Diff              @@
##                4.x     #105      +/-   ##
============================================
+ Coverage     91.85%   91.94%   +0.08%     
- Complexity      519      525       +6     
============================================
  Files            50       50              
  Lines          1302     1316      +14     
============================================
+ Hits           1196     1210      +14     
  Misses          106      106              

Impacted Files	Coverage Δ
src/Options/FormatterOptions.php	87.69% <85.71%> (+1.48%)	:arrow_up:

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