Rename key_to_str() to the more idiomatic to_string()

This makes the function easier to find for newcomers because
to_string() is the obvious name. It enables format() to do the
conversion automatically which seems like good idea (since there is
no other obvious representation).

Of course this change makes it a bit harder to grep but that's not
a problem with clang tooling.

We need to cast the function in one place when calling transform()
but that's acceptable.

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