Extract parameters' types from example values for api_blue_print format

[khiav223577]

Most of the type you don't need to provide this option manually. We extract types from values automatically.

rspec_api_documentation/README.md

Line 370 in e850da7

- `type: [:file, :array, :object, :boolean, :integer, :number, :string]`. Will set a type for the parameter. Most of the type you don't need to provide this option manually. We extract types from values automatically.

The README says it will try to extract types from values automatically, but it doesn't seem to work with api_blue_print format. It seems to work for open_api format.

rspec_api_documentation/lib/rspec_api_documentation/open_api/helper.rb

Lines 6 to 16 in 229fe27

	def extract_type(value)
	case value
	when Rack::Test::UploadedFile then :file
	when Array then :array
	when Hash then :object
	when TrueClass, FalseClass then :boolean
	when Integer then :integer
	when Float then :number
	else :string
	end
	end

This PR add this feature for api_blue_print format.