[Finder] Added GLOB_BRACE support in Finder::in() method
[Finder] Added a test case for the GLOB_BRACE in Finder:in().
[Finder] Included GLOB_BRACE support in the CHANGELOG.
feature #9926 [Finder] Added GLOB_BRACE support in Finder::in() method (jakzal)

This PR was merged into the 2.5-dev branch.

Discussion
----------

[Finder] Added GLOB_BRACE support in Finder::in() method

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9705
| License       | MIT
| Doc PR        | ~

**before**

```php
$finder->files()->in([
    'My/First/Directory',
    'My/Second/Directory',
    'My/Third/Directory',
]);
```

**after**

```php
$finder->files()->in('My/{First,Second,Third}/Directory');
```

Commits
-------

e2698fc [Finder] Included GLOB_BRACE support in the CHANGELOG.
30814d3 [Finder] Added a test case for the GLOB_BRACE in Finder:in().
da67f5d [Finder] Added GLOB_BRACE support in Finder::in() method