fix(@schematics/angular): improve paths and exclude options

Currently the library schematic doesn't support adding a secondary entry-point and having deep imports is not recommanded.

It's best if paths are more stricter when having a secondary entry-point instead of a wildcard.

Instead of :
```
"lib/*": [
  "dist/lib/*"
]
```

Users should configure:
```
"lib/secondary": [
  "dist/lib/secondary"
]
```

This would allow a better DX experience when using auto imports in IDE's.

Closes: #15952

packages/schematics/angular/library/index.ts

@@ -68,13 +68,6 @@ function updateTsConfig(packageName: string, distRoot: string) {
         tsconfig.compilerOptions.paths[packageName] = [];
       }
       tsconfig.compilerOptions.paths[packageName].push(distRoot);
-
-      // deep import & secondary entrypoint support
-      const deepPackagePath = packageName + '/*';
-      if (!tsconfig.compilerOptions.paths[deepPackagePath]) {
-        tsconfig.compilerOptions.paths[deepPackagePath] = [];
-      }
-      tsconfig.compilerOptions.paths[deepPackagePath].push(distRoot + '/*');
     });
   };
 }

packages/schematics/angular/library/index_spec.ts

@@ -208,9 +208,6 @@ describe('Library Schematic', () => {
       expect(tsConfigJson.compilerOptions.paths.foo).toBeTruthy();
       expect(tsConfigJson.compilerOptions.paths.foo.length).toEqual(1);
       expect(tsConfigJson.compilerOptions.paths.foo[0]).toEqual('dist/foo');
-      expect(tsConfigJson.compilerOptions.paths['foo/*']).toBeTruthy();
-      expect(tsConfigJson.compilerOptions.paths['foo/*'].length).toEqual(1);
-      expect(tsConfigJson.compilerOptions.paths['foo/*'][0]).toEqual('dist/foo/*');
     });
 
     it(`should append to existing paths mappings`, async () => {

packages/schematics/angular/workspace/files/tsconfig.json.template

@@ -2,7 +2,7 @@
   "compileOnSave": false,
   "compilerOptions": {
     "baseUrl": "./",
-    "outDir": "./dist/out-tsc",<% if (strict) { %>
+    "outDir": "./dist",<% if (strict) { %>
     "noImplicitAny": true,
     "noImplicitReturns": true,
     "noImplicitThis": true,