Add Dict validations

[dinispeixoto]

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[maurobaraldi]

I started to look at this feature and use the lists validation as a reference. I've listed the following validations for dictionaries.

• is_not_empty
• has_length_lower
• has_length_greater
• has_length_equals
• contains_key
• contains_value
• all_values_of_same_type
• all_values_of_type

What do you think about this items?

[tiagogandarezff]

I started to look at this feature and use the lists validation as a reference. I've listed the following validations for dictionaries.

• is_not_empty
• has_length_lower
• has_length_greater
• has_length_equals
• contains_key
• contains_value
• all_values_of_same_type
• all_values_of_type

What do you think about this items?

They seem good. Those follow what it's planned for this project. Thanks for the input.