No need for `perform_types` about sidekiq.cr

[asterite]

The code is kind of hard to read because that macro is inside another macro... the \{% things basically say "don't execute this now, instead generate this", so later when the method_added macro is added to the final class it can be executed well.

[asterite]

One last thing: the name comparison should probably be if a_def.name == "perform", but right now that doesn't work, I need to define comparison between string literals and macro ids.

[mperham]

Whoa, that's some metametaprogramming BUT it solves a major API compatibility issue with Sidekiq.rb: having to define arg types separately from perform. THANK YOU!