WIP: adding metrics for mqtt3 #1270

Job	Run time
clang-sanitizers (,address,undefined)	3m 25s
clang-sanitizers (,thread)	3m 13s
linux-shared-libs	2m 35s
linux-compat (manylinux2014-x86)	2m 37s
linux-compat (manylinux1-x86)	2m 32s
linux-compat (manylinux1-x64)	2m 25s
linux-compat (fedora-34-x64)	2m 24s
linux-compat (manylinux2014-x64)	2m 26s
linux-compat (al2-x64)	2m 32s
linux-compat (rhel8-x64)	2m 36s
linux-compiler-compat (clang-8)	2m 46s
linux-compiler-compat (clang-15)	2m 45s
linux-compiler-compat (clang-6)	2m 45s
linux-compiler-compat (gcc-4.8)	2m 32s
linux-compiler-compat (clang-10)	2m 45s
linux-compiler-compat (clang-9)	2m 46s
linux-compiler-compat (clang-11)	2m 43s
linux-compat (opensuse-leap)	2m 38s
macos (dispatch_queue)	1m 17s
linux-compiler-compat (gcc-11)	2m 43s
linux-compiler-compat (clang-17)	2m 46s
linux-compiler-compat (gcc-6)	2m 30s
linux-compiler-compat (gcc-7)	2m 43s
macos (kqueue)	1m 24s
windows-shared-libs	4m 4s
linux-compiler-compat (gcc-8)	2m 44s
downstream	2m 42s
linux-compiler-compat (gcc-5)	2m 37s
windows-vc17 (x86)	3m 15s
macos-x64	1m 29s
windows-vc17 (x64)	3m 22s
windows-app-verifier	3m 54s
windows	3m 39s
	1h 29m 34s

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