Add a warning to giraffe when using minimizers without distance hints

[xchang1]

Changelog Entry

To be copied to the draft changelog by merger:

• Add a warning to giraffe when using minimizers without distance hints

Description

Running giraffe with minimizers that don't include the distance hints in the payload is very slow. Warn users when this happens

[xchang1]

Actually this is too slow and it would be too difficult to try to go through just a handful of minimizers or reads before mapping. I think it would be better to try to change the minimizer index to remember if it has distances or not