Adds the Switch operation for processors, similar to a std switch statement.

Core processors additions:

• text_to_speech and speech_to_text processor using Google Cloud APIs
• realtime processor to create a live aka realtime processor from a turn-based LLM (audio in/out only)
• pdf processor to work with PDF files and extract tokens for LLMs
• drive processor to get documents from Google Drive (sheets, slides and docs)
• github processor to get code from github
• jinja processor to create prompts from classes

Examples:

• several CLIs to test processors from the CLI (including live and realtime processors)