Add Database Factory Classifier

[stefanzweifel]

Adds support for the new Database Factories coming in Laravel 8: https://laravel.com/docs/8.x/database-testing#writing-factories

Closes #181

[codecov]

Codecov Report

Merging #183 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #183      +/-   ##
============================================
+ Coverage     92.70%   92.76%   +0.05%     
- Complexity      314      318       +4     
============================================
  Files            62       63       +1     
  Lines           987      995       +8     
============================================
+ Hits            915      923       +8     
  Misses           72       72              

Impacted Files	Coverage Δ	Complexity Δ
src/Classifier.php	100.00% <ø> (ø)	7.00 <0.00> (ø)
src/Classifiers/DatabaseFactoryClassifier.php	100.00% <100.00%> (ø)	4.00 <4.00> (?)

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