Move v4 UUID validation to an `ActiveModel::EachValidator`

[benjaminoakes]

track_ballast/lib/track_ballast/uuid_management.rb

Lines 72 to 78 in 87fd96c

	return if uuid.match(REGEXP_UUID_V4)
	TrackBallast.logger.tagged("invalid-uuid") do |logger|
	logger.error(class: self.class.name, uuid: uuid, caller: caller.join("\n"))
	end
	errors.add :uuid, :not_v4_uuid, message: "is not a v4 UUID"

Related: #14