onnxruntime

BeamScorer to use contiguous arrays for BeamHypotheses (#15923)

### Description
Change BeamHypotheses to not use a stl::priority_queue and instead all
BeamHypotheses use a single buffer that they each get a small slice of.

As the beam count is really small (typically 4,8, max of 32) and the
array size fixed, the BeamHypotheses just does a sorted insert into an
array.

This also allows for the BeamHypotheses inside of the BeamSearchScorer
to be a single fixed allocation vs an onnxruntime::FastAllocVector.

### Motivation and Context
The goal is to simplify the memory usage and make the code more easily
ported to CUDA.