Add Value::borrow_any_{ref,mut} to get a typed reference without owne… #928

Job	Run time
runefmt	1m 47s
rustfmt	10s
docs	1m 59s
clippy	1m 55s
basics	1s
msrv	1m 56s
no_default_features	49s
miri_rune	5m 33s
build_feature (capture-io)	55s
miri_rune_alloc	4m 10s
build_feature (cli,doc)	1m 21s
no_std_minimal	3m 5s
build_feature (cli,fmt)	1m 22s
wasm	1m 0s
build_feature (cli)	1m 30s
build_feature (workspace)	58s
build_feature (languageserver)	1m 15s
build_feature (byte-code)	51s
test	10m 55s
	41m 32s

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