Add `selectIndex` directly to `LogicArray` (and `Logic`?) to enable one-liner accesses in generated SV.

### Motivation

The current implementations of `selectIndex` and `selectFrom` generate a big `Case`, which is functionally correct but leads to bigger SV generated outputs. It would be nice to have a way to more easily access the APIs and also generate nicer SV.

### Desired solution

Add `selectIndex` to `LogicArray` and maybe `Logic` as well, with a custom SV module that generates a one-liner (or inlineable).

### Alternatives considered

_No response_

### Additional details

_No response_