Filter and group runs by slot in every SDK

Multi-slot stations now upload one run per slot; the SDKs needed the matching fields to read and query them.

• Added: execution_id, slot_key and slot_name on run creation and run details in the Python, C#, C++ and MATLAB clients
• Added: execution_ids and slot_keys filters on run listing, so one start's runs or one fixture position's history can be pulled in a single call
• Updated: clients regenerated from the current API specification; no breaking changes