Move Lucky specific methods to a separate module

[paulcsmith]

Move these...

• lucky_flow/src/lucky_flow.cr

  Lines 24 to 37 in b14b864

  	def visit(action : Lucky::Action.class, as user : User? = nil)
  	visit(action.route, as: user)
  	end
  	def visit(route_helper : Lucky::RouteHelper, as user : User? = nil)
  	url = route_helper.url
  	uri = URI.parse(url)
  	if uri.query && user
  	url += "&backdoor_user_id=#{user.id}"
  	elsif uri.query.nil? && user
  	url += "?backdoor_user_id=#{user.id}"
  	end
  	session.url = url
  	end

• lucky_flow/src/lucky_flow.cr

  Lines 59 to 75 in b14b864

  	# Fill a form created by Lucky that uses a LuckyRecord::Form
  	#
  	# Note that Lucky and LuckyRecord are required to use this method
  	#
  	# ```
  	# fill_form QuestionForm,
  	# title: "Hello there!",
  	# body: "Just wondering what day it is"
  	# ```
  	def fill_form(
  	form : LuckyRecord::Form.class | LuckyRecord::VirtualForm.class,
  	**fields_and_values
  	)
  	fields_and_values.each do |name, value|
  	fill "#{form.new.form_name}:#{name}", with: value
  	end
  	end

Into a module called LuckyFlow::LuckyHelpers

Will likely require splitting spec into Lucky specific tests.

There should also be a flag similar to what is done in Carbon: https://github.com/luckyframework/carbon/blob/master/README.md#development that let's you run specs with and without Lucky to ensure that it works for no matter what

[jwoertink]

One question here is, would the lucky specs be default, or if this is geared for any framework, then would you want something to wrap the spec call like ./bin/spec which runs crystal spec -D include-lucky or whatever?