✨ Port Solady files that are suitable for `mcopy`

[Vectorized]

@atarpara

Feel free, but we have to maintain two copies, which is a pain.

[atarpara]

@Vectorized I will start after foundry update support for cancun.

[raxhvl]

I can take up a few files.

[atarpara]

@raxhvl you are free to add files from solady which is compatible to new opcodes for gas saving.