SNOW-3055677 Implement SESSION_ID_AS_STRING capability

[sfc-gh-rsavenok]

Description

Send SESSION_ID_AS_STRING: true in CLIENT_CAPABILITIES during login so the server returns sessionId as a string, avoiding precision loss with large numeric IDs. Updates JSDoc type annotations in sf.js and queryContextCache.js to reflect the new string type.

sessionId is only used for logging—no functional changes.

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]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

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

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