Allow configurable concurrent uploads

[jvillafanez]

Ref https://github.com/owncloud/enterprise/issues/5372

The CurlMultiHandler will be used instead of the old StreamHandler in order to support concurrent uploads to the s3 storage. Curl is mandatory, so there is no reason to switch back.

The number of concurrent requests can be adjusted via config.php file:

'objectstore' => [
        'class' => getenv('OWNCLOUD_OBJECTSTORE_CLASS'),
        'arguments' => [
          'bucket' => getenv('OWNCLOUD_OBJECTSTORE_BUCKET'),
          'autocreate' => getenv('OWNCLOUD_OBJECTSTORE_AUTOCREATE'),
          'part_size' => 52428800,
          'concurrency' => 4,   // <---------------
          'options' => [
            'endpoint' => getenv('OWNCLOUD_OBJECTSTORE_ENDPOINT'),
            'version' => getenv('OWNCLOUD_OBJECTSTORE_VERSION'),
            'region' => getenv('OWNCLOUD_OBJECTSTORE_REGION'),
            'use_path_style_endpoint' => getenv('OWNCLOUD_OBJECTSTORE_PATHSTYLE') === 'true',
            'command.params' => [
              'PathStyle' => getenv('OWNCLOUD_OBJECTSTORE_PATHSTYLE') === 'true',
            ],
            'credentials' => [
              'key'   => getenv('OWNCLOUD_OBJECTSTORE_KEY'),
              'secret'  => getenv('OWNCLOUD_OBJECTSTORE_SECRET'),
            ],
          ],
        ],
      ],

If no value is configured, the aws-sdk will choose one (3 requests by default)

To be checked with both guzzle 5 and 7

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[phil-davis]

@jvillafanez Should this have a release scheduled?
If so, then a release issue is needed, and put it in the Release project.