Add SECURITY.md with vulnerability reporting instructions & Add SPDX license header to SECURITY.md & other updates

[hannahli-nv]

Description

Update codes.

This PR contains 3 new commit(s).

Commits included:

319f2fb fix oom case on sm120
4996c53 Add SPDX license header to SECURITY.md
b4cee86 Add SECURITY.md with vulnerability reporting instructions

CI Configuration

config:
  build: true
  # valid options are "ops" and "benchmark"
  test: ["ops", "benchmark"]

Checklist

• Code formatted and imports sorted via repo specifications (./format.sh)
• Documentation updated (if needed)
• CI configuration reviewed

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[hannahli-nv]

/ok to test 319f2fb