Add example apps to show every SDK method

[gr2m]

Comment bellow if you'd like to work on one or more of these:

• createAckEvent
• createConfirmationEvent
• createDoneEvent
• createErrorsEvent
• createReferencesEvent
• createTextEvent
• getFunctionCalls
• getUserConfirmation
• getUserMessage
• parseRequestBody
• prompt (not sure if we need to demonstrate both prompt and prompt.stream. The latter is a better UX I think).
• prompt.stream
• transformPayloadForOpenAICompatibility
• verifyAndParseRequest

I don't think we need demos for these methods as they are all included in verifyAndParseRequest() which I'd recommend people to use instead. But if you can think of a good use case that would be helpful to demonstrate for these, feel free to add it.

• verifyRequest
• verifyRequestByKeyId
• fetchVerificationKeys