[m-users.] A little `fact_table` library I wrote

[Aistis Raulinaitis]

To get to grips with Mercury I wrote a set of typeclasses and supporting
functions that I think would be useful to the general community.

https://github.com/sheganinans/fact_table_utils

It's a start, there are a few low hanging fruit.
One I see is switching from string concatenation to string.builder.
Also maybe sending strings directly to a `io.text_output_stream` instead of
using `io.write_strings`.

Also, it's very likely someone else has written something similar to my
work.
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