fix(language-service): implement realpath to resolve symlinks (#40593)
fix(language-service): implement realpath to resolve symlinks (#40593)

The `LanguageServiceAdapter` must implement `realpath` in order to resolve
symlinks in `node_modules`.

Local libraries are often symlinked in `node_modules` by adding a local
dependency in `package.json`.

Fix https://github.com/angular/vscode-ng-language-service/issues/1083

PR Close #40593

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