implement IPv6 scoped addresses (RFC4007) #13010

Job	Run time
check_format	1m 38s
x86_64-gnu-test (1.7.3)	35m 26s
x86_64-gnu-test-preview_mt	5m 37s
x86_64-musl-test	38m 11s
x86_64-gnu-test (1.8.2)	33m 9s
x86_64-gnu-test (1.9.2)	35m 45s
x86_64-gnu-test (1.10.1)	38m 26s
x86_64-gnu-test (1.11.2)	35m 57s
x86_64-gnu-test (1.12.2)	34m 21s
x86_64-gnu-test (1.13.3)	36m 46s
x86_64-gnu-test (1.14.0)	35m 2s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 55s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 59s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	35m 8s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	34m 46s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	33m 46s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	34m 12s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	33m 49s
	9h 29m 53s

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