The
Invacar clearly had sliding doors for the disabled,
but not a very practicable car. And this is the point there is more involved than just the doors, the Rolls Royce do a front opening door, but I would not think you are looking for one of them, likely the Ford B Max as said is one of the best, I found the old Vauxhall Agila very good as being so narrow there was room in a parking space to open doors wide.
I had a Renault Kangoo well actually a GoWing as converted for the disabled, and the sliding doors were useless, there was a large box section below the door opening making getting into rear seat rather hard, but front seat was fine, and with a mother who was an amputee, having the door actually made it safer, as no where to fall when transferring.
So would say you want a tall car, but not too tall, my Kia Sorento is too tall, and the Jaguar XE too low, so need happy medium, but your own height will make a difference, always arguing about car seats, I keep saying easy for a short person to put seat back before getting out, not so easy for a tall person to put them back before getting in.