Add Metrics API and aggregator (#2247) #2997

Job	Run time
ruby-versions / Generate Ruby versions	2s
Ruby 2.4 & Rack 2, options - null	48s
Ruby 2.4 & Rack 3, options - null	50s
Ruby 2.5 & Rack 2, options - null	59s
Ruby 2.5 & Rack 3, options - null	51s
Ruby 2.6 & Rack 2, options - null	2m 23s
Ruby 2.6 & Rack 3, options - null	2m 21s
Ruby 2.7 & Rack 2, options - null	1m 0s
Ruby 2.7 & Rack 3, options - null	1m 18s
Ruby 3.0 & Rack 2, options - null	47s
Ruby 3.0 & Rack 3, options - null	46s
Ruby 3.1 & Rack 2, options - null	1m 2s
Ruby 3.1 & Rack 3, options - null	53s
Ruby 3.2 & Rack 2, options - null	1m 9s
Ruby 3.2 & Rack 3, options - null	57s
Ruby 3.3 & Rack 2, options - null	1m 3s
Ruby 3.3 & Rack 3, options - null	49s
Ruby head & Rack 2, options - null	50s
Ruby head & Rack 3, options - null	47s
Ruby jruby & Rack 2, options - null	2m 23s
Ruby jruby & Rack 3, options - null	2m 24s
Ruby jruby-head & Rack 2, options - null	2m 11s
Ruby jruby-head & Rack 3, options - null	2m 18s
Ruby 3.2 & Rack 0, options - null	45s
Ruby 3.2 & Rack 2, options - null	1m 0s
Ruby 3.2 & Rack 3, options - { "rubyopt": "--enable-frozen-string-literal --debug=frozen-string-literal" }	52s
Ruby 3.2 & Rack 3, options - { "codecov": 1 }	49s
	32m 17s

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