Add options to new_with_braces

[paulbalandan]

Description

$ vendor/bin/php-cs-fixer describe new_with_braces     
Description of new_with_braces rule.
All instances created with `new` keyword must (not) be followed by braces.

Fixer is configurable using following options:
* named_class (bool): whether named classes should be followed by parentheses; defaults to true
* anonymous_class (bool): whether anonymous classes should be followed by parentheses; defaults to true

Fixing examples:
 * Example #1. Fixing with the default configuration.
   ---------- begin diff ----------
   --- Original
   +++ New
   @@ -1,4 +1,4 @@
    <?php

   -$x = new X;
   -$y = new class {};
   +$x = new X();
   +$y = new class() {};

   ----------- end diff -----------

 * Example #2. Fixing with configuration: ['anonymous_class' => false].
   ---------- begin diff ----------
   --- Original
   +++ New
   @@ -1,3 +1,3 @@
    <?php

   -$y = new class() {};
   +$y = new class {};

   ----------- end diff -----------

 * Example #3. Fixing with configuration: ['named_class' => false].
   ---------- begin diff ----------
   --- Original
   +++ New
   @@ -1,3 +1,3 @@
    <?php

   -$x = new X();
   +$x = new X;

   ----------- end diff -----------

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[MGatner]

Don't ask me where I picked this up, but I'm accustomed to spaces in between the declaration for anonymous classes:

$banana = new class () extends Config {}

Do we have rules to enforce that one way or another?

[paulbalandan]

It's the space_before_parenthesis option of class_definition rule.

* Example #5. Fixing with configuration: ['space_before_parenthesis' => true].
   ---------- begin diff ----------
   --- Original
   +++ New
   @@ -1,2 +1,2 @@
    <?php
   -$foo = new class(){};
   +$foo = new class () {};

   ----------- end diff -----------