feat(stageleft): allow developers to add their own re-export rewrites… #1006

Job	Run time
pre_job	6s
macos-universal (universal2-apple-darwin)	4m 9s
linux-cross (aarch64-unknown-linux-gnu, aarch64)	3m 36s
linux (x86_64-unknown-linux-gnu)	3m 44s
windows (x86_64-pc-windows-msvc, x64)	10m 51s
linux-cross (armv7-unknown-linux-gnueabihf, armv7)	3m 45s
linux (i686-unknown-linux-gnu)	4m 46s
windows (i686-pc-windows-msvc, x86)	11m 15s
windows (aarch64-pc-windows-msvc, x64)	13m 18s
Release	0s
	55m 30s

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