[FEATURE REQUEST] Sync AS' Notes and Steam Notes

[Korb]

Current Behavior (if any)

The game can be supplied with two sets of user notes - those added via the browser (using the browser extension) and those added in the Steam Launcher (Steam Notes).

Desired Behavior

Whether a user adds a note in the browser or in the Steam Launcher, they edit the same notes. At the very least, after creating or editing a note in the Steam Launcher, they will see the changes made on the game page in the browser, and vice versa.

Motivation / Use Case for Changing the Behavior

These are duplicate entities that can be combined using Steam as a note syncing tool, which will be very useful for those like me who are forced to use only local storage for notes due to browser (Mozilla Firefox) limitations.

[candela97]

Linking #429 (comment).

We won't be able to modify Steam client behaviour, but if the webapi endpoints start working, we can probably provide an overview of them if Steam doesn't plan on doing it.