Fix that models can clobber each others' attachment reflections

Consider the following model definitions:

    class User < ApplicationRecord
      has_one_attached :avatar
    end

    class Group < ApplicationRecord
      has_one_attached :avatar
    end

If you attempt to reflect on the User model's avatar attachment via User.reflect_on_attachment, you could receive a reflection for the Group model's avatar attachment. Fix this by ensuring that each model class uses its own Hash object to track attachment reflections.

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