Repository navigation

Add experimental, opt-in component caching #9076

Job	Run time
benchmark	1m 32s
Test compatibility with Primer ViewComponents (main)	21m 39s
test (Rails 8.0, Ruby 3.4)	40s
test (Rails main_head, Ruby head)	42s
test (Rails main, Ruby 4.0)	37s
test (Rails 8.1, Ruby 4.0)	51s
test (Rails 7.1, Ruby 3.2)	39s
test (Rails 7.2, Ruby 3.3)	1m 12s
coverage	10s
	28m 2s