Inference support for T5 and FLAN-T5 model families (#5763) * llama : add inference support and model types for T5 and FLAN-T5 model families * llama : add new API functions to support encoder-decoder models: llama_encode(), llama_model_has_encoder(), llama_model_decoder_start_token() * common, llama-cli, llama-batched : add support for encoder-decoder models * convert-hf : handle shared token embeddings tensors in T5Model * convert-hf : add support for SentencePiece BPE tokenizer in T5Model (for Pile-T5 models) * convert-hf : add MT5ForConditionalGeneration and UMT5ForConditionalGeneration to architectures supported by T5Model * convert : add t5 tokenizer tests, use "slow" HF tokenizer for t5 --------- Co-authored-by: Stanisław Szymczyk <sszymczy@gmail.com> Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>