Allow multiple importmaps in config/importmaps/ #497

Job	Run time
Tests (Ruby 3.1, Gemfile)	11s
Tests (Ruby 3.1, gemfiles/rails_7_0_propshaft.gemfile)	11s
Tests (Ruby 3.1, gemfiles/rails_7_1_propshaft.gemfile)	10s
Tests (Ruby 3.1, gemfiles/rails_main_propshaft.gemfile)	34s
Tests (Ruby 3.1, gemfiles/rails_7_0_sprockets.gemfile)	14s
Tests (Ruby 3.1, gemfiles/rails_7_1_sprockets.gemfile)	11s
Tests (Ruby 3.1, gemfiles/rails_main_sprockets.gemfile)	33s
Tests (Ruby 3.2, Gemfile)	14s
Tests (Ruby 3.2, gemfiles/rails_7_0_propshaft.gemfile)	14s
Tests (Ruby 3.2, gemfiles/rails_7_1_propshaft.gemfile)	10s
Tests (Ruby 3.2, gemfiles/rails_main_propshaft.gemfile)	11s
Tests (Ruby 3.2, gemfiles/rails_7_0_sprockets.gemfile)	11s
Tests (Ruby 3.2, gemfiles/rails_7_1_sprockets.gemfile)	11s
Tests (Ruby 3.2, gemfiles/rails_main_sprockets.gemfile)	11s
Tests (Ruby 3.3, Gemfile)	11s
Tests (Ruby 3.3, gemfiles/rails_7_0_propshaft.gemfile)	12s
Tests (Ruby 3.3, gemfiles/rails_7_1_propshaft.gemfile)	10s
Tests (Ruby 3.3, gemfiles/rails_main_propshaft.gemfile)	15s
Tests (Ruby 3.3, gemfiles/rails_7_0_sprockets.gemfile)	13s
Tests (Ruby 3.3, gemfiles/rails_7_1_sprockets.gemfile)	12s
Tests (Ruby 3.3, gemfiles/rails_main_sprockets.gemfile)	19s
	4m 58s

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