fix: remove constructor doc comments

[rishtigupta]

PR Description:

Drupal.org mentioned some fixes in order to let momento be listed in their index:

1. FILE: src/Client/MomentoClientFactory.php

  /**
   * MomentoClientFactory constructor.
   */
  public function __construct() {

FILE: src/MomentoCacheBackendFactory.php

  /**
   * MomentoCacheBackendFactory constructor.
   */
  public function __construct(

FILE: src/MomentoCacheBackend.php

  /**
   * MomentoCacheBackend constructor.
   */
  public function __construct(

The documentation comment for constructors is not mandatory anymore. If it is given, the description must be Constructs a new [class name] object. where [class name] includes the class namespace.

2. FILE: src/MomentoCacheBackendFactory.php

  public function __construct(
        MomentoClientFactory $momento_factory,
        CacheTagsChecksumInterface $checksum_provider
    ) {

FILE: src/MomentoCacheBackend.php

  public function __construct(
        $bin,
        $client,
        CacheTagsChecksumInterface $checksum_provider
    ) {

Function and method declarations are written on a single line