Add support for new Single Item Sharing

[blacktwin]

Describe the issue Add support to Plex's new Single Item Share

Code snipppets

For server admin accounts

Retrieve shared items:

GET

https://plex.tv/api/v2/shared_sources/owned
https://plex.tv/api/v2/shared_sources/received # unknown returns

Additional params:

ownerId={USER_ID}&includeItems=true

X-Plex-Token and X-Plex-Client-Identifier are required.

owned results:

<sharedSources>
<sharedSource id="5607" origin="server://{MACHINE_ID}" name="SERVERNAME" serverId="{serverId}" status="accepted" sharedItemsCount="1" createdAt="2020-06-12 12:28:51 UTC" accessToken="TOKEN">
<invited id="SHAREDUSERID" uuid="SHAREDUSERuuid" title="SHARED_USERTITLE" username="SHAREDUSERNAME" restricted="0" thumb="https://plex.tv/users/SHAREDUSERuuid/avatar?c=xxxx"/>
<owner id="ADMINUSERID" uuid="ADMINUSERuuid" title="ADMINUSER_TITLE" username="ADMINUSERNAME" restricted="0" thumb="https://plex.tv/users/ADMINUSERuuid/avatar?c=xxxxxx"/>
<sharedItems>
<sharedItem id="9244" uri="server://{MACHINE_ID}/com.plexapp.plugins.library/library/metadata/{RATING_KEY}" status="accepted" title="{TITLE}" type={MEDIA_TYPE} createdAt="2020-06-12 12:41:43 UTC"/>
</sharedItems>
</sharedSource>
</sharedSources>

Share a single item:

POST

https://plex.tv/api/v2/shared_items

Payload

{"items":[{"uri":"server://{MACHINE_ID}/com.plexapp.plugins.library/library/metadata/{RATING_KEY}","type":"{MEDIA_TYPE}","title":"{TITLE}"}],"invitedId":{USERID}}

Only one item can be shared to one user at a time.

To delete a shared item:

DELETE

https://plex.tv/api/v2/shared_items/{SHARED_ITEMID}

For non admin accounts

Get shared items

GET

https://{SERVER_IP:PORT}/library/shared/all?includeMeta=1

Expected behavior Share a single time. Get shared items. Delete single items.