API request: Support preview endpoint for individual raindrop

[azaslavsky]

The API docs currently support pulling down the permanent copy of a single raindrop via the developer API for PRO users like so: https://api.raindrop.io/rest/v1/raindrop/{id}/cache. However, it is not possible to get the "preview" version of the bookmark in question in this manner. I notice that there is already an internal endpoint, used by the app's preview iframe, structured like: https://api.raindrop.io/v1/raindrop/preview/{id}. Would it be possible to expose this endpoint (for PRO users, of course) in the developer API as well?

My use case is as follows: my main use for raindrop is to bookmark and tag interesting articles from around the web for import into my personal knowledge base (Obsidian). I have a sync script that pulls each new raindrop once it's created (ie, there is only ever one pull per article) and stores the permanent copy locally. The permanent copy, though, is just the entirety of the HTML at the time of bookmarking - this creates a lot of cruft in my local database, and requires a lot of processing to avoid producing very large files. The preview view is much cleaner, keeping only the most important parts of the article, while discarding useless bits like styling and navigation.