onnxruntime

Update SAM2 benchmark for testing torch compile modes and profiling (#22279)

This pull request introduces several enhancements to the benchmarking
process for the SAM2 model, including:
(1) Add profiling capabilities.
(2) test torch compile modes (none will disable compile and fallback to
eager mode)
(3) Update README for setting up the environment.

### Documentation Updates:
* README.md: Updated instructions to create separate conda environments
for GPU and CPU benchmarking, and detailed the parameters and outputs of
the benchmark script.

### Benchmark Script Enhancements:
* benchmark_sam2.py: Added optional parameters for enabling NVTX and
PyTorch profiling, and adjusted the initialization and execution flow to
incorporate these profiling options.

These changes enhance the flexibility and functionality of the
benchmarking process, making it easier to profile and benchmark the SAM2
model on different hardware configurations.