Have `cap-fs-ext` re-export `OpenOptionsExt` and `MetadataExt`. #1672

Job	Run time
Check Cross-Compilation on Windows (stable)	2m 45s
Check Cross-Compilation on Windows (beta)	1m 20s
Check Cross-Compilation on Rust nightly on Windows (nightly)	1m 38s
Check Cross-Compilation (stable)	1m 13s
Check Cross-Compilation on Rust nightly (nightly)	1m 58s
Check Cross-Compilation (beta)	1m 35s
Rustfmt	4s
Test (stable)	30s
Test with Rust nightly (ubuntu)	30s
Fuzz Targets	44s
Test (windows-latest)	1m 33s
Test with Rust nightly (windows)	1m 27s
Test (windows-2019)	2m 12s
Test linux-raw support (ubuntu)	29s
Test (msrv)	2m 8s
Test linux-raw support (ubuntu-20.04)	28s
Test (macos-latest)	28s
Test on Musl (ubuntu)	43s
Test (macos-11)	1s
Test (beta)	33s
Test (ubuntu-20.04)	33s
Test (aarch64-ubuntu)	2m 25s
	25m 17s

Provide feedback