test: add globbing utility for testing Markdown as doctests (#1649) #1013

Job	Run time
pre_job	5s
linux-cross (aarch64-unknown-linux-gnu, aarch64)	3m 36s
linux (x86_64-unknown-linux-gnu)	3m 30s
linux-cross (armv7-unknown-linux-gnueabihf, armv7)	3m 44s
linux (i686-unknown-linux-gnu)	4m 48s
macos-universal (universal2-apple-darwin)	4m 34s
windows (x86_64-pc-windows-msvc, x64)	10m 53s
windows (i686-pc-windows-msvc, x86)	10m 50s
windows (aarch64-pc-windows-msvc, x64)	12m 21s
Release	0s
	54m 21s

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