[FEATURE]: LLM-prompted text generators

[ghanse]

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Problem statement

LLMs follow user prompts to generate text with deep contextual understanding. While customers can use expression columns to generate text with LLMs (e.g. using Databricks' ai_query function), it would be useful to create a built-in TextGenerator class to support this capability.

Proposed Solution

Create a new TextGenerator class to generate text with ai_query.

Additional Context

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