Implements support for multiple objects and multiple locales in the localize method, bringing it to feature parity with the existing translate method functionality.

Problem

The translate method supports both multiple keys and multiple locales:

# Multiple keys
MiniI18n.t([:hello, :bye]) #=> ['hello', 'bye']

# Multiple locales  
MiniI18n.t(:hello, locale: [:en, :es, :fr]) #=> ['hello', 'hola', 'bonjour']

However, the localize method only supported single objects and single locales, limiting its flexibility for batch operations.

Solution

Added the same multiple object and multiple locale capabilities to the localize method:

# Multiple objects
date = Date.new(2023, 12, 25)
number = 1234.56
MiniI18n.l([date, number]) 
#=> ["Monday 25, December, 2023", "1,234.56"]

# Multiple locales
MiniI18n.l(number, locale: [:en, :es, :fr])
#=> ["1,234.56", "1.234,56", "1 234,56"]

# Works with existing options
MiniI18n.l([1000, 2000], as: :currency, locale: :es)
#=> ["1.000 €", "2.000 €"]

Implementation

• Added early return logic in localize method to detect arrays
• Implemented multiple_localize and multiple_locales_localize helper methods following the same pattern as the translate method
• Maintains full backward compatibility - all existing functionality preserved
• Works with both localize and l alias methods
• Supports all existing options (format, as, type, etc.)

Testing

• Added comprehensive test coverage for both multiple objects and multiple locales scenarios
• All 45 tests pass (43 existing + 2 new)
• Tested with all built-in locales and edge cases
• Integration tests confirm compatibility with existing locale data

This change enables more efficient batch localization operations while maintaining the library's existing API and behavior.

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