[freature] sequentional settings file merge

Imagine we have the following code:

```ruby
    load_from_yaml root.join("config/redis/default.yml")
    load_from_yaml root.join("config/redis/#{env}.yml"), strict: false
```

**may bee** it would be nice to have this for file with the same nature/type/domain:

```ruby
load_from_yaml "file1", "file2", "file3", "file4"
```