Allow multiple importmaps in config/importmaps/ #499

Job	Run time
Tests (Ruby 3.1, Gemfile)	1m 25s
Tests (Ruby 3.1, gemfiles/rails_7_0_propshaft.gemfile)	32s
Tests (Ruby 3.1, gemfiles/rails_7_1_propshaft.gemfile)	34s
Tests (Ruby 3.1, gemfiles/rails_main_propshaft.gemfile)	1m 0s
Tests (Ruby 3.1, gemfiles/rails_7_0_sprockets.gemfile)	31s
Tests (Ruby 3.1, gemfiles/rails_7_1_sprockets.gemfile)	32s
Tests (Ruby 3.1, gemfiles/rails_main_sprockets.gemfile)	1m 4s
Tests (Ruby 3.2, Gemfile)	1m 21s
Tests (Ruby 3.2, gemfiles/rails_7_0_propshaft.gemfile)	29s
Tests (Ruby 3.2, gemfiles/rails_7_1_propshaft.gemfile)	33s
Tests (Ruby 3.2, gemfiles/rails_main_propshaft.gemfile)	36s
Tests (Ruby 3.2, gemfiles/rails_7_0_sprockets.gemfile)	34s
Tests (Ruby 3.2, gemfiles/rails_7_1_sprockets.gemfile)	33s
Tests (Ruby 3.2, gemfiles/rails_main_sprockets.gemfile)	41s
Tests (Ruby 3.3, Gemfile)	1m 23s
Tests (Ruby 3.3, gemfiles/rails_7_0_propshaft.gemfile)	35s
Tests (Ruby 3.3, gemfiles/rails_7_1_propshaft.gemfile)	35s
Tests (Ruby 3.3, gemfiles/rails_main_propshaft.gemfile)	38s
Tests (Ruby 3.3, gemfiles/rails_7_0_sprockets.gemfile)	31s
Tests (Ruby 3.3, gemfiles/rails_7_1_sprockets.gemfile)	37s
Tests (Ruby 3.3, gemfiles/rails_main_sprockets.gemfile)	37s
	15m 21s

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