Naums Mogers c04aec9d52 [Mosaic] Extend tpu.sem_signal with subcore_id
This change:
- Bumps up the version of Mosaic to 4 in `serde.cc`.

- Adds optional `subcore_id` parameter to `tpu.sem_signal` for signalling specific subcores.

- Extends deserialization to correctly parse the older versions of Mosaic without the new parameter `subcore_id` of `tpu.sem_signal`.

PiperOrigin-RevId: 698163836
2024-11-19 15:22:59 -08:00
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