Add DifferenceBy for slices with any types

[yesmishgan]

This request contains a new function to find the difference between two slices consisting of any elements using the callback function

[yesmishgan]

Hi, can you review it @samber ?

[miles-ton]

this looks useful

[yesmishgan]

thank you! but i can't merge without @samber 's code review

[takanuva15]

Note this completes part of the request under #411

[druvv]

I would really appreciate this functionality being built into lo!

[takanuva15]

@samber Seems this PR is a highly requested feature; there is already another duplicate PR just like this one here: https://github.com/samber/lo/pull/426/files

[takanuva15]

Did some more research and I realized there is another library with a massive slice util library, that includes this DifferenceBy function along with UnionBy. Worth a look:
https://github.com/duke-git/lancet?tab=readme-ov-file#-18-slice-contains-some-functions-to-manipulate-slice----index

[yesmishgan]

@samber Hello! Can you review it? I want to contribute it and use in my projects to improve usability