[node-modules] Implement .bin symlinks creation (#1099)

* Adds .bin symlink creation for Posix systems

* Adds windows cmd-shim support for .bin links

* Pass native paths to cmdShim

* Use copyFilePromise for file copying (no difference in perf, just less code)

* Removes unused import

* Remove outdated symlinks

* Add some inline comments and do some code cleanups

Author: larixer

.pnp.js

@@ -0,0 +1,20 @@
+releases:
+  "@yarnpkg/cli": prerelease
+  "@yarnpkg/plugin-node-modules": prerelease
+
+declined:
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"

.yarn/cache/@zkochan-cmd-shim-npm-4.3.0-00786a1c45-2.zip

@@ -8,6 +8,7 @@
     "@yarnpkg/plugin-pnp": "workspace:^2.0.0-rc.18",
     "@yarnpkg/pnp": "workspace:^2.0.0-rc.18",
     "@yarnpkg/pnpify": "workspace:^2.0.0-rc.19",
+    "@zkochan/cmd-shim": "^4.3.0",
     "clipanion": "^2.1.5",
     "micromatch": "^4.0.2"
   },