MarianTokenizerFast requested
### Feature request

Hello I want a MarianTokenizerFast. I am a soldier from Ukrain and we are using the Pretrained MarianMT Models to help translate Russian commands. Currently the tokenizer is too slow so we need a faster one to translate faster! Sometimes it takes 1 second and the missile is already launch so FAST IS NEEDED!

### Motivation

Yesterday Russian launch a missile to attach a hospital in my hometown. We hindered the information and use MarianMT to translate it. But the tokenization is too slow, and we failed to stop the missile, and a lot of people die.

### Your contribution

We can give you a Medal of Honor after we won the war.
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