Improve passing large _Batch to steps

[gabrielmbmb]

The mp.Queue that we're using to pass the data between the steps is very slow when it's used to send a lot of data (for example when accumulating embeddings from GenerateEmbeddings step for the DeitaFiltering step).

We need to develop a better way (probably using an storage and dumping the content to a file so it can be read back by the other step) to pass large batches, or using a different Queue implementation like this one: https://github.com/alex-petrenko/faster-fifo

[gabrielmbmb]

I've tried faster-fifo but mmap.mmap object cannot be pickled :(