Optimize retrieval of share-types property

[guruz]

It has a O(numberOfFiles) complexity when doing the PROPFIND/Discovery

See owncloud/client#5313 (comment)

[PVince81]

Some ideas:

• extend the share manager API to allow specify multiple nodes and do a select ... where fileid in (...) and share_type in (...) call
• or: join directly with the filecache table.

@DeepDiver1975 stated that share manager and filecache logic go together and if devs want to replace one they also need to replace the other.

[PVince81]

Actually a duplicate of #25266 which also contains some comments about how to improve it on the server side

[lock]

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