feat(Gate): Create or Update sharing states for existing business par…

[fabiodmota]

feat: Create or Update sharing states for existing business partners

Description

When the Gate receives an output business partner it needs to just set the corresponding sharing state to success by itself.

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[nicoprow]

Fixes #367 (Task created retroactively for this pull request)

[nicoprow]

The created succesful sharing state needs to also have the shared BPN. This can be taken from the output data and persisted for the sharing state.