Add optional SQL logging spec helper #237

Job	Run time
build (gemfiles/Gemfile.activerecord-5.0, 2.4)	2m 29s
build (gemfiles/Gemfile.activerecord-5.2, 2.4)	2m 26s
build (gemfiles/Gemfile.activerecord-5.1, 2.4)	2m 20s
build (gemfiles/Gemfile.activerecord-6.0, 2.5)	1m 52s
build (gemfiles/Gemfile.activerecord-6.1, 2.5)	1m 57s
build (gemfiles/Gemfile.activerecord-8.1, 3.3)	2m 0s
build (gemfiles/Gemfile.activerecord-7.0, 2.7)	2m 6s
build (gemfiles/Gemfile.activerecord-7.1, 2.7)	1m 54s
build (gemfiles/Gemfile.activerecord-7.2, 3.1)	1m 47s
build (gemfiles/Gemfile.activerecord-8.0, 3.2)	2m 5s
	20m 56s

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