Introduce new array and string functionality

Added

• Larapulse\Support\Handlers\Arr class
• Larapulse\Support\Handlers\Str class
• Larapulse\Support\Handlers\RegEx class to work with Regular Expressions
• Larapulse\Support\Helpers\RegEx to generate Regular Expressions
• Larapulse\Support\Helpers\DataTypes class
• Array functions: array_flatten, array_flatten_assoc, array_depth, is_array_of_type, is_array_of_types, is_array_of_instance, array_is_assoc
• String functions: str_pop, str_shift, str_cut_start, str_cut_end, str_lower, str_upper, str_title, str_length, str_words, str_substr, str_ucfirst, str_starts_with, str_ends_with