Feat: Add Site Name and Address Name to Generic Business Partner Model

[nicoprow]

Description

This pull request adds site name and address name to the generic business partner model. By this changing the gate and the orchestrator api. I also added a migration script for the Gate to persist the new names.

Since we now have specific names the cleaning service now uses site and address name of the generic business partner to fill the respective names in the L/S/A model. Legal name will be still taken from the name parts though because we don't expect sharing members to provide the legal name themselves.

Test values and tests have been adapted where appropriate.

Contributes to #672

Pre-review checks

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• DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• Copyright and license header are present on all affected files