🎭 Sample parameters

[hejny]

Allow sample(s) to be written for each parameter in the pipeline. This would be very useful for multi-shot prompting and anomaly detection. Each sample must meet expectations. If not, it results in PromptbookLogicError.

• Create a special syntax for this in .ptbk.md

See more in discussion here https://github.com/webgptorg/promptbook/discussions/43