Add a custom deprecator to SimpleForm #107

Job	Run time
test (Gemfile, 3.2)	20s
test (Gemfile, 3.1)	17s
test (Gemfile, 3.0)	31s
test (Gemfile, 2.7)	30s
test (gemfiles/Gemfile-rails-main, 3.2)	22s
test (gemfiles/Gemfile-rails-main, 3.1)	56s
test (gemfiles/Gemfile-rails-main, 3.0)	59s
test (gemfiles/Gemfile-rails-main, 2.7)	38s
test (gemfiles/Gemfile-rails-7-0, 3.2)	21s
test (gemfiles/Gemfile-rails-7-0, 3.1)	11s
test (gemfiles/Gemfile-rails-7-0, 3.0)	14s
test (gemfiles/Gemfile-rails-7-0, 2.7)	28s
test (gemfiles/Gemfile-rails-6-1, 3.2)	15s
test (gemfiles/Gemfile-rails-6-1, 3.1)	11s
test (gemfiles/Gemfile-rails-6-1, 3.0)	10s
test (gemfiles/Gemfile-rails-6-1, 2.7)	26s
test (gemfiles/Gemfile-rails-6-1, 2.6)	28s
test (gemfiles/Gemfile-rails-6-1, 2.5)	31s
test (gemfiles/Gemfile-rails-6-0, 3.0)	14s
test (gemfiles/Gemfile-rails-6-0, 2.7)	36s
test (gemfiles/Gemfile-rails-6-0, 2.6)	35s
test (gemfiles/Gemfile-rails-6-0, 2.5)	30s
test (gemfiles/Gemfile-rails-5-2, 2.6)	31s
test (gemfiles/Gemfile-rails-5-2, 2.5)	26s
	10m 40s

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