feat(Sharing): Add per-recipient permissions

[provokateurin]

No description provided.

[provokateurin]

/backport to stable35

[provokateurin]

@icewind1991 I did one more small thing which is that the check for effective permissions is only done when you want to grant a permission to a recipient. If you yourself are denied a permission, you can deny it for a child recipient of yours.

[susnux]

/backport to stable35

[backportbot]

The backport to stable35 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable35
git pull origin stable35

# Create the new backport branch
git checkout -b backport/63854/stable35

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 362d7365 3e838a2f 48025f62 d0a62e0b fc064129 5567e142 3e9f34ea 5bb0bc0e 4d05a092

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/63854/stable35

Error: Failed to create pull request: Validation Failed: {"resource":"PullRequest","code":"custom","message":"A pull request already exists for nextcloud:backport/63854/stable35."} - https://docs.github.com/rest/pulls/pulls#create-a-pull-request

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.