Basic support of jax.lax.gather in TessellateIPU.
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TessellateIPU `gather` integration using popops `popops::MultiSlice<>` vertex.
At the moment, it only supports slice size 1 and the following gather dimensions
configuration:
```python
jax.lax.GatherDimensionNumbers(
offset_dims=(),
collapsed_slice_dims=(0,),
start_index_map=(0,))
```
Note: it does not take advantage of worker threads in the current configuration.
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TessellateIPU
gatherintegration using popopspopops::MultiSlice<>vertex.At the moment, it only supports slice size 1 and the following gather dimensions configuration:
Note: at the moment, it does not take advantage of worker threads.