add metadata support #1411

Job	Run time
linux-shared-libs	12m 21s
downstream	12m 41s
macos (kqueue)	10m 47s
clang-sanitizers (,address,undefined)	12m 53s
windows-vc17 (x86)	12m 13s
macos-x64	11m 28s
clang-sanitizers (,thread)	13m 17s
windows	13m 0s
windows-app-verifier	14m 55s
macos (dispatch_queue)	14m 38s
windows-vc17 (x64)	12m 35s
windows-shared-libs	12m 46s
linux-compat (manylinux2014-x64)	12m 18s
linux-compat (al2-x64)	12m 14s
linux-compat (manylinux2014-x86)	12m 18s
linux-compat (fedora-34-x64)	11m 46s
linux-compat (manylinux1-x86)	12m 19s
linux-compat (rhel8-x64)	12m 37s
linux-compat (manylinux1-x64)	11m 59s
linux-compiler-compat (clang-11)	12m 33s
linux-compiler-compat (clang-8)	13m 20s
linux-compiler-compat (gcc-8)	13m 1s
linux-compiler-compat (clang-10)	13m 17s
linux-compiler-compat (gcc-7)	12m 12s
linux-compiler-compat (gcc-5)	12m 12s
linux-compiler-compat (clang-15)	13m 16s
linux-compiler-compat (clang-6)	12m 46s
linux-compiler-compat (clang-17)	13m 32s
linux-compiler-compat (clang-9)	12m 58s
linux-compiler-compat (gcc-4.8)	11m 30s
linux-compat (opensuse-leap)	12m 53s
linux-compiler-compat (gcc-11)	12m 35s
linux-compiler-compat (gcc-6)	12m 3s
	6h 57m 13s

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