Improve the performance of `concat`

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
@rluvaton is working on improving the concat kernel's performance and I am filing this ticket ot track it

Describe the solution you'd like
Make concat faster

Describe alternatives you've considered

• see Improve concat performance, and add append_array for some array builder implementations #7309

Additional context

[alamb]

Completed in #7309