feat: add support for custom id selector in dataservice entities

[alcaidio]

Introduced a mechanism to specify a custom id selector for entities in the dataservice. (like for ngrx entities)
When an entity does not have a default identifier named 'id', the custom selector can be used.
The custom id selector must return either a string or a number. enhances flexibility for handling entities with non-standard identifiers in the dataservice.

I'm not sure about what I did; this is my first PR here, and I hope I'm not too far from the solution. Looking forward to discussing any potential improvements.

[alcaidio]

I dont know why my PR has 9 file changed ? I only change one file and create one under libs directory??

[rainerhahnekamp]

@alcaidio, thanks but can you please add .nx/workspace-data to .gitignore?

[rainerhahnekamp]

Hey @alcaidio, thanks also for the other PR, but I suggest we make sure that this one gets merged first before continuing.

So you still have the nx/workspace in the PR and the package-lock.json. Both shouldn't be there. Can you please fix that?

Btw, thanks for that unit test. It was urgently needed...

[alcaidio]

I've updated my PR @rainerhahnekamp , thanks for your work :)
I see the withPagination feature it didn't see it in the readme, is that on purpose?

[rainerhahnekamp]

Thanks. It is not on purpose that withPagination is missing in the docs :)

[rainerhahnekamp]

Hey @alcaidio,

sorry to bother you again:

• The CI is failing because of an issue which has been fixed in the meantime. Please rebase
• You have an any in some of your methods. Can you replace it?
• Unfortunately, we don't have any tests for withDataService. You are not introducing here a breaking change, do you?

[alcaidio]

I don't know how to solve the problem, I've updated my branch and I can't get the tests to work :/ sorry, it's too complicated for me, I'll come back to it if I have time. thanks anyway.