Benchmarks: Micro benchmark - add nvbench based kernel-launch & sleep-kernel

[WenqingLan1]

This pull request adds support for NVBench-based GPU micro-benchmarks to SuperBench.

• Integrated the NVBench submodule
• Implemented two benchmarks
  • nvbench-sleep-kernel
  • nvbench-kernel-launch
• updated documentation and added example scripts

Example config:

version: v0.12
superbench:
  enable:
  # nvbench benchmarks
  - nvbench-sleep-kernel:single
  - nvbench-sleep-kernel:list
  - nvbench-sleep-kernel:range
  - nvbench-sleep-kernel:range-step
  - nvbench-kernel-launch
  var:
    default_local_mode: &default_local_mode
      modes:
      - name: local
        proc_num: 4
        prefix: CUDA_VISIBLE_DEVICES={proc_rank}
        parallel: yes
  benchmarks:
    nvbench-sleep-kernel:single:
      <<: *default_local_mode
      timeout: 300
      parameters:
        duration_us: "50"                   # Single value format
        timeout: 30
    nvbench-sleep-kernel:list:
      <<: *default_local_mode
      timeout: 300
      parameters:
        duration_us: "[25,50,75]"         # List format - no spaces after commas
        timeout: 30
    nvbench-sleep-kernel:range:
      <<: *default_local_mode
      timeout: 300
      parameters:
        duration_us: "[0:5]"           # Range format
        timeout: 30
    nvbench-sleep-kernel:range-step:
      <<: *default_local_mode
      timeout: 300
      parameters:
        duration_us: "[0:50:10]"         # Range with step format
        timeout: 30
    nvbench-kernel-launch:
      <<: *default_local_mode
      timeout: 300

[codecov]

Codecov Report

❌ Patch coverage is 89.11917% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.78%. Comparing base (c99380b) to head (2877feb).

Files with missing lines	Patch %	Lines
...rbench/benchmarks/micro_benchmarks/nvbench_base.py	80.39%	20 Missing ⚠️
...enchmarks/micro_benchmarks/nvbench_sleep_kernel.py	98.07%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #750      +/-   ##
==========================================
+ Coverage   85.69%   85.78%   +0.08%     
==========================================
  Files         102      105       +3     
  Lines        7699     7892     +193     
==========================================
+ Hits         6598     6770     +172     
- Misses       1101     1122      +21     

Flag	Coverage Δ
cpu-python3.10-unit-test	71.41% <88.94%> (+0.43%)	⬆️
cpu-python3.7-unit-test	70.88% <89.11%> (+0.46%)	⬆️
cuda-unit-test	83.74% <88.94%> (+0.13%)	⬆️

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