Python: Add save_information_batch to SemanticTextMemory class

[sinyubonnie-ho]

Currently I am using save_information in the memory (https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/memory/semantic_text_memory.py) which only allows me to create embedding and save the record one by one. I want to do it in batch to speed up the process. I will work on adding the function save_information_batch to the SemanticTextMemory class and create PR. Thanks!