additional information for the plex api

[ADRFranklin]

Hi,

I am currently working on a project that makes use of the plex apis and am currently generating a http client from this library, and just wanted to pop in and give some additional information based on some data I have found myself.

So just off the top of my head for what I am currently doing, I can think of 2 additions that change or add to the data you currently have.

1. One being includeElements set to Stream for the endpoint /library/metadata/<ratingKey>/children which adds the Media section to the data, which is not currently present in your response.

2. Another new endpoint you don't have yet is /statistics/resources which allows returning resources like cpu/ram stats. What I have for this one is: https://github.com/petio-team/petio/blob/dev/server/src/services/plex/serverInfo.ts

3. Same as number 2, though using bandwidth endpoint: /statistics/bandwidth which returns bandwidth data. What I have for this one is: https://github.com/petio-team/petio/blob/dev/server/src/services/plex/bandwidth.ts

Let me know if you want me to create a PR for this or not, hope this helps a bit. I can continue to make issues and prs about other endpoints I found, if this is acceptable.