Add `set_symlink_permissions` and `access` functions to `DirExt` #1621

Job	Run time
Check Cross-Compilation (stable)	1m 45s
Check Cross-Compilation (stable)	1m 45s
Check Cross-Compilation (beta)	1m 28s
Check Cross-Compilation (beta)	1m 28s
Check Cross-Compilation on Rust nightly (nightly)	2m 41s
Check Cross-Compilation on Rust nightly (nightly)	2m 41s
Check Cross-Compilation on Windows (stable)	2m 14s
Check Cross-Compilation on Windows (stable)	2m 14s
Check Cross-Compilation on Rust nightly on Windows (nightly)	2m 3s
Check Cross-Compilation on Rust nightly on Windows (nightly)	2m 3s
Check Cross-Compilation on Windows (beta)	1m 53s
Check Cross-Compilation on Windows (beta)	1m 53s
Rustfmt	12s
Rustfmt	12s
Fuzz Targets	1m 7s
Fuzz Targets	1m 7s
Test (stable)	26s
Test (stable)	26s
Test (windows-latest)	1m 22s
Test (windows-latest)	1m 22s
Test linux-raw support (ubuntu)	52s
Test linux-raw support (ubuntu)	52s
Test (msrv)	3m 50s
Test (msrv)	5m 32s
Test linux-raw support (ubuntu-20.04)	57s
Test linux-raw support (ubuntu-20.04)	57s
Test (windows-2019)	1m 33s
Test (windows-2019)	57s
Test (macos-latest)	1m 24s
Test (macos-latest)	52s
Test (macos-11)	1m 9s
Test (macos-11)	1m 9s
Test with Rust nightly (ubuntu)	49s
Test with Rust nightly (ubuntu)	49s
Test on Musl (ubuntu)	1m 0s
Test on Musl (ubuntu)	1m 0s
Test (beta)	53s
Test (beta)	53s
Test with Rust nightly (windows)	2m 1s
Test with Rust nightly (windows)	2m 1s
Test (ubuntu-20.04)	46s
Test (ubuntu-20.04)	46s
Test (aarch64-ubuntu)	1m 47s
Test (aarch64-ubuntu)	1m 10s
	1h 4m 21s

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