Add Mooncake to Lux benchmarking suite

[yebai]

For more comprehensive benchmarking, let's add Mooncake to the Lux's benchmarking set:

• results: https://lux.csail.mit.edu/benchmarks/
• code: https://github.com/LuxDL/Lux.jl/tree/main/benchmarks

Cc @avik-pal, who might be able to provide pointers on what is needed.

(this issue is copied from #361 (comment))

[avik-pal]

Yes, let's do this. I need to cleanup the benchmarks on Lux end (the benchmarks are somewhat broken since the monorepo setup). I will update here once that is done