AIDB local llama

[iakinsey]

What Changed?

• Add documentation for AIDB's local llama support

[timwaizenegger]

example usage would be nice; especially for users not familiar with the matter e.g.

aidb=# select aidb.decode_text('llama_instruct', 'why is the sky blue?');
                                                                                                                                              decode_text
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 The sky is blue because it reflects light from the sun. The color of the sky depends on the amount and intensity of sunlight that reaches Earth's surface, as well as the composition of the atmosphere and clouds. In general, blue is a color associated with water (such as in the ocean or rivers)
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