Add support for GenericContainer security options

[cristianrgreco]

Summary of changes

• add withSecurityOpt(...securityOptions: string[]) to the TestContainer interface
• implement withSecurityOpt in GenericContainer by wiring values to HostConfig.SecurityOpt
• add a behavior-focused test that sets no-new-privileges and verifies NoNewPrivs=1 from /proc/1/status
• document withSecurityOpt in the containers feature docs

Verification commands run

• npm ci --ignore-scripts
• npm run format
• npm run lint
• npm test -- packages/testcontainers/src/generic-container/generic-container.test.ts -t "should set security options"

Test results summary

• targeted test passed:
  • GenericContainer > should set security options

Closes #841

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