feat: add impl-level exporting QoL macro #1037

Job	Run time
clippy	2m 21s
rustfmt	6s
runefmt	1m 48s
docs	1m 55s
basics	1s
rune_nightly	4m 6s
miri_rune	6m 56s
miri_rune_alloc	5m 32s
msrv	2m 16s
no_default_features	1m 11s
build_feature (capture-io)	1m 1s
no_std (ubuntu-latest, minimal)	1m 1s
build_feature (cli,doc)	1m 40s
wasm	1m 13s
no_std (macos-latest, minimal)	1m 26s
build_feature (cli,fmt)	1m 38s
build_feature (cli)	1m 28s
build_feature (workspace)	57s
build_feature (languageserver)	1m 26s
build_feature (byte-code)	1m 7s
test	11m 25s
	50m 34s

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