[FEATURE] Federated Sharing via OpenCloudMesh

[KrausMatthias]

Problem Statement

Nextcloud, Owncloud, Opencloud, Seafile etc. allow sharing of files and folders across instances using the OpenCloudMesh protocol

Proposed Solution

• Add support for OCM filesharing using opencloudmesh-rs (I'm the maintainer of opencloudmesh-rs)

Alternative Solutions

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Additional Context

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User Impact

OxiCloud Users could send / receive file shares from/to Nextcloud, Owncloud etc.

Implementation Ideas

Integrate opencloudmesh-rs. While there is still some work to do on the opencloudmesh-rs crate, it should integrate well with OxiCloud as it's also based on axum/hyper.