Allow `debug` expressions in redaction macros #1076

Job	Run time
Run the in-tree version of cargo-insta on ourselves	43s
Check on MSRV	28s
Test on Latest (ubuntu-latest)	1m 3s
Test latest deps	1m 4s
Test on Latest (macos-latest)	49s
Build docs	26s
Test on Latest (windows-latest)	3m 29s
Test with minimal version resolution	34s
clippy	11s
rustfmt	10s
	8m 57s

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