Allow multiple importmaps in config/importmaps/ #519

Job	Run time
Tests (Ruby 3.1, Gemfile)	1m 36s
Tests (Ruby 3.1, gemfiles/rails_7_0_propshaft.gemfile)	45s
Tests (Ruby 3.1, gemfiles/rails_7_1_propshaft.gemfile)	53s
Tests (Ruby 3.1, gemfiles/rails_main_propshaft.gemfile)	52s
Tests (Ruby 3.1, gemfiles/rails_7_0_sprockets.gemfile)	45s
Tests (Ruby 3.1, gemfiles/rails_7_1_sprockets.gemfile)	54s
Tests (Ruby 3.1, gemfiles/rails_main_sprockets.gemfile)	53s
Tests (Ruby 3.2, Gemfile)	1m 34s
Tests (Ruby 3.2, gemfiles/rails_7_0_propshaft.gemfile)	48s
Tests (Ruby 3.2, gemfiles/rails_7_1_propshaft.gemfile)	56s
Tests (Ruby 3.2, gemfiles/rails_main_propshaft.gemfile)	38s
Tests (Ruby 3.2, gemfiles/rails_7_0_sprockets.gemfile)	49s
Tests (Ruby 3.2, gemfiles/rails_7_1_sprockets.gemfile)	51s
Tests (Ruby 3.2, gemfiles/rails_main_sprockets.gemfile)	33s
Tests (Ruby 3.3, Gemfile)	1m 40s
Tests (Ruby 3.3, gemfiles/rails_7_0_propshaft.gemfile)	50s
Tests (Ruby 3.3, gemfiles/rails_7_1_propshaft.gemfile)	55s
Tests (Ruby 3.3, gemfiles/rails_main_propshaft.gemfile)	29s
Tests (Ruby 3.3, gemfiles/rails_7_0_sprockets.gemfile)	46s
Tests (Ruby 3.3, gemfiles/rails_7_1_sprockets.gemfile)	56s
Tests (Ruby 3.3, gemfiles/rails_main_sprockets.gemfile)	29s
	18m 52s

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