SNOW-3055676 Remove smkId string conversion

[sfc-gh-rsavenok]

Description

Please explain the changes you made here.

Checklist

• Create tests which fail without the change (if possible)
• Make all tests (unit and integration) pass (npm run test:unit and npm run test:integration)
• Extend the types in index.d.ts file (if necessary)
• Extend the README / documentation and ensure is properly displayed (if necessary)
• Provide JIRA issue id (if possible) or GitHub issue id in commit message

[sfc-gh-rsavenok]

• SNOW-3055677 Implement SESSION_ID_AS_STRING capability #1345
• SNOW-3055676 Remove smkId string conversion #1344 👈 (View in Graphite)
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.