walk: Send WorkerResults in batches #1076

Job	Run time
Extract crate metadata	3s
Ensure 'cargo fmt' has been run	10s
Minimum supported rust version	1m 15s
aarch64-unknown-linux-gnu (ubuntu-20.04)	8m 6s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	8m 8s
arm-unknown-linux-musleabihf (ubuntu-20.04)	3m 25s
i686-pc-windows-msvc (windows-2019)	3m 50s
i686-unknown-linux-gnu (ubuntu-20.04)	6m 27s
i686-unknown-linux-musl (ubuntu-20.04)	3m 16s
x86_64-apple-darwin (macos-12)	5m 21s
x86_64-pc-windows-gnu (windows-2019)	5m 7s
x86_64-pc-windows-msvc (windows-2019)	7m 48s
x86_64-unknown-linux-gnu (ubuntu-20.04)	3m 57s
x86_64-unknown-linux-musl (ubuntu-20.04)	8m 5s
Publish to Winget	0s
	1h 4m 58s

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