Add moderator and Reddit Premium status to User model on public-api

[fsvreddit]

Closes #193

💸 TL;DR

My last PR (#256) only made a change on the reddit package for Devvit Web. Sorry about this - this closes the same gaps on the classic reddit-api package.

This pull request addresses two issues on the User model:

• NSFW property is returning the wrong value - it currently returns the "I am over 18 and want to see NSFW content" property, rather than the "I am NSFW" property.
• Two underlying properties available on the Data API (isMod and isGold) are not available on the User model. I am now exposing these properly, using the current "Reddit Premium" terminology instead of Reddit Gold.

🧪 Testing Steps / Validation

I have tested these locally by modifying files in the node_modules folder. However it is not possible for me to run full CI on this.

For some time I have had my own User model that transforms these values in the same way.

✅ Checks

• CI tests (if present) are passing
• Adheres to code style for repo
• Contributor License Agreement (CLA) completed if not a Reddit employee