Pg Enums

[JuzerShakir]

This PR focuses on changing the enum value types, from integer to PostgreSQL enum type. The following field types were changed:

• sabeel#apartment in 46ca139.
• thaali.size in daf6152.
• transaction.mode in 86040c1.

These changes have made it easier to later add values to these as a migration rather than assigning it to a constant array type where adding new values in between would lead to inconsistent data and errors.

The APARTMENTS, SIZES, MODES & ROLES constants defined in the config/initializers/constants.rb file are now defined in their respective classes and will be accessible via their namespace:

• Sabeel::APARTMENTS.
• Thaali::SIZES.
• Transaction::MODES.
• Role::NAMES.

Since the enum type needs to be set as a hash type, we cannot use the constants as it's an array type. But we will use it as a reference and give the #to_h_titleize_values method to it to return a hash type where the keys will be self & its values will be in a titleized format of self. This way we can add more values to the constant array regardless of which index we instantiate them in and make sure we don't have any duplicates.

• Define a #to_h_titleize_values to Array class in 3d123d6

Other changes:

• Fixed the depreciated method Faker#free_email in e4bee27.
• refactor thaali form in b646eb2.
• Initiate new instances with default values for the Thaali, Sabeel & Transaction entities in c06efc4, d6b8d68, & d04ff7e which will help remove a lot of redundant code.