Made NWBSlicer manufacturer-aware.

[cboulay]

New helper _match_stream_key(child, stream_keys) in ezmsg-nwb/src/ezmsg/nwb/slicer.py:

• stream_keys=None → keep literal container name (no change).
• exact match → use literal name.
• Else look up the linked Device's manufacturer attribute via child.electrodes.table['group'][0].device.manufacturer. If child.name == f"{manufacturer}_{key}" for some key in stream_keys, treat it as a match and expose the stream under the bare key so slicer.stream_names == ['NPLAY'] and message.key == 'NPLAY' — that way downstream fitters keyed by the user's request still find their data.
• Manufacturer = "" or "unknown" → no suffix match (avoids accidentally matching unrelated streams that happen to share a suffix when manufacturer metadata isn't present).