add typed `init_with` to Crystal Crecto models

README.md

Usage

class User < Crecto::Model
  schema "users" do
    field :name, String
  end
end

user = User.init_with(name: "hello") # doesn't fail
user = User.init_with(other_param: "hello") # can't compile, `other_param=` isn't defined on a User instance!

crecto_model.cr

class Crecto::Model
  macro init_with(**args)
    {{@type}}.new.tap do |item|
    {% for setter, value in args %}
    {% raise "#{@type} doesn't have a setter called '#{setter}'" unless @type.methods.map(&.name.stringify).includes?("#{setter}=") %}
      item.{{setter.id}} = {{value}}
    {% end %}
    end
  end
end