おすすめ商品のダミーデータ生成コマンドを追加

[nanasess]

bin/console eccube:plugin:recommend4:fixtures:generate でおすすめ商品のダミーデータ生成が可能なコマンドを追加

## おすすめ商品を登録する(デフォルト10個)
bin/console eccube:plugin:recommend4:fixtures:generate  --relatedproducts=10

[codecov-commenter]

Codecov Report

Merging #46 (8a45c69) into 4.0 (1168633) will decrease coverage by 11.58%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##                4.0      #46       +/-   ##
=============================================
- Coverage     86.13%   74.54%   -11.59%     
- Complexity       64       74       +10     
=============================================
  Files             7        8        +1     
  Lines           238      275       +37     
=============================================
  Hits            205      205               
- Misses           33       70       +37     

Flag	Coverage Δ
tests	74.54% <0.00%> (-11.59%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Command/GenerateDummyDataCommand.php	0.00% <0.00%> (ø)

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