fix($cookies): remove the deprecated $cookieStore factory

Closes #16465

BREAKING CHANGE:

The $cookieStore has been removed. Migrate to the $cookies service. Note that
for object values you need to use the `putObject` & `getObject` methods as
`get`/`put` will not correctly save/retrieve them.

Before:
```js
$cookieStore.put('name', {key: 'value'});
$cookieStore.get('name'); // {key: 'value'}
$cookieStore.remove('name');
```

After:
```js
$cookies.putObject('name', {key: 'value'});
$cookies.getObject('name'); // {key: 'value'}
$cookies.remove('name');
```

Author: mgol

angularFiles.js

@@ -109,7 +109,6 @@ var angularFiles = {
     ],
     'ngCookies': [
       'src/ngCookies/cookies.js',
-      'src/ngCookies/cookieStore.js',
       'src/ngCookies/cookieWriter.js'
     ],
     'ngMessageFormat': [

docs/content/api/index.ngdoc

@@ -222,11 +222,7 @@ Use the ngCookies module to handle cookie management within your application.
       {@link ngCookies#service Services / Factories}
     </td>
     <td>
-      The following services are used for cookie management:
-      <ul>
-        <li>The {@link ngCookies.$cookies $cookie} service is a convenient wrapper to store simple data within browser cookies.</li>
-        <li>{@link ngCookies.$cookieStore $cookieStore} is used to store more complex data using serialization.</li>
-      </ul>
+      The {@link ngCookies.$cookies $cookies} service is a convenient wrapper to store simple data within browser cookies.
     </td>
   </tr>
 </table>