Add `Crystal::Tracing` for runtime tracing #11593

Job	Run time
x86_64-musl-test	39m 15s
check_format	1m 49s
x86_64-gnu-test (1.7.3)	36m 7s
x86_64-gnu-test (1.8.2)	35m 7s
x86_64-gnu-test-preview_mt	5m 58s
x86_64-gnu-test (1.9.2)	33m 55s
x86_64-gnu-test (1.10.1)	38m 44s
x86_64-gnu-test (1.11.2)	35m 44s
x86_64-gnu-test (1.12.2)	35m 36s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	36m 32s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 11s
deploy_api_docs	0s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	35m 29s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	35m 53s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	34m 12s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	35m 3s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 15s
	8h 28m 50s

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