Use composition over inheritance for Lotus::Utils::LoadPaths

Before:

  irb(main):001:0> require 'lotus/utils/load_paths'
  => true
  irb(main):002:0> Lotus::Utils::LoadPaths.new.methods.size
  => 171

After:

  irb(main):001:0> require 'lotus/utils/load_paths'
  => true
  irb(main):002:0> Lotus::Utils::LoadPaths.new.methods.size
  => 57
  irb(main):003:0> Object.new.methods.size
  => 56