Tests

Allow to exclude all `has_many` and `has_one` associations by default #24

Job	Run time
Ruby head, ActiveRecord head, sqlite	1m 1s
Ruby 3.3, ActiveRecord 7.1, postgresql	48s
Ruby 3.3, ActiveRecord 7.1, mysql	47s
Ruby 3.3, ActiveRecord 7.1, sqlite	46s
Ruby 3.2, ActiveRecord 7.0, sqlite	42s
Ruby 3.1, ActiveRecord 6.1, sqlite	41s
Ruby 3.0, ActiveRecord 6.0, sqlite	44s
	5m 29s

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