refactor(ngcc): add packageName property to EntryPoint interface (#37040)

This commit adds a `packageName` property to the `EntryPoint` interface.
In a subsequent commit this will be used to retrieve the correct ngcc
configuration for each package, regardless of its path.

PR Close #37040

packages/compiler-cli/ngcc/test/integration/ngcc_spec.ts

@@ -1572,7 +1572,7 @@ runInEachFileSystem(() => {
           },
           {
             name: _('/node_modules/deep_import/package.json'),
-            contents: '{"name": "deep-import", "es2015": "./index.js", "typings": "./index.d.ts"}',
+            contents: '{"name": "deep_import", "es2015": "./index.js", "typings": "./index.d.ts"}',
           },
           {
             name: _('/node_modules/deep_import/entry_point.js'),