add mapEntries function

[silveltman]

similar to https://radash-docs.vercel.app/docs/object/map-entries

Seems to make sense because just like Object.values and Object.keys, Object.entries does also exist in regular javascript.

[eranhirsch]

We have entries() and map(). We tend not to add very simple compositions of other utils if they don't benefit at runtime or can provide better typing than using the composition itself.

[cjquines]

i think we could add better typing for mapEntries than the composition entries, map, fromEntries

in particular, the same arguments can be made for mapEntries, mapKeys, and mapValues; if we have the latter two, i don't see why not to have mapEntries

[eranhirsch]

If the request is to also build the object after the iteration i agree and think it is a good addition to the library, i think the best api for this would be similar to pullObject, and a good name would be transformObject.
It exists in hack as Dict\pull_with_keys

[cjquines]

i believe that is the request! i'll move this to good first issue