Add out-of-the-box pipelines and components for common NLP / LLM use case

[jenniferjiangkells]

Components:

• LLM (local)
• Postprocessing
• StructuredGeneration (? - possibly roll this in LLM with outline)
• VectorStorage (out-of-scope - separate concern to langchain)
• Preprocessing (out-of-scope - separate concern to spacy)

Pipelines (subclass base pipeline):

• QAPipeline - e.g. medical Q&A, chatbot applications, patient education, physician training
• CodingPipeline - e.g. medical coding tasks, MiADE / MedCAT
• SummarizationPipeline - e.g. discharge summary generation, clinical documentation / ambient AI applications
• CustomPipeline - other

These will be completed as part of #78:

• HFTransformer
• SpacyNLP
• Langchain
• Sklearn (out-of-scope - future)