[GB300] Add MUFU.EX2 benchmarking

[antferdom]

microbenchmark: exp2-gb300.cu

git clone https://github.com/jamieliNVIDIA/mufu_ex2_bench.git
cd mufu_ex2_bench

# Step 2: Compile with (Using sm100f for GB300 or sm103a for GB200)
nvcc -O3 -gencode=arch=compute_103a,code=sm_103a --extended-lambda -o /tmp/exp2-gb300.out exp2-gb300.cu

Main reference: Benchmarking MUFU.EX2 performance