Enable blank_line_between_import_groups

[paulbalandan]

Description

$ vendor/bin/php-cs-fixer describe blank_line_between_import_groups
Description of blank_line_between_import_groups rule.
Putting blank lines between `use` statement groups.

Fixing examples:
 * Example #1.
   ---------- begin diff ----------
   --- Original
   +++ New
   @@ -1,5 +1,7 @@
    <?php

    use function AAC;
   +
    use const AAB;
   +
    use AAA;

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

 * Example #2.
   ---------- begin diff ----------
   --- Original
   +++ New
   @@ -1,8 +1,10 @@
    <?php
    use const AAAA;
    use const BBB;
   +
    use Bar;
    use AAC;
    use Acme;
   +
    use function CCC\AA;
    use function DDD;

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

 * Example #3.
   ---------- begin diff ----------
   --- Original
   +++ New
   @@ -1,8 +1,10 @@
    <?php
    use const BBB;
    use const AAAA;
   +
    use Acme;
    use AAC;
    use Bar;
   +
    use function DDD;
    use function CCC\AA;

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

 * Example #4.
   ---------- begin diff ----------
   --- Original
   +++ New
   @@ -1,8 +1,13 @@
    <?php
    use const AAAA;
    use const BBB;
   +
    use Acme;
   +
    use function DDD;
   +
    use AAC;
   +
    use function CCC\AA;
   +
    use Bar;

   ----------- 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