Add all_gather_invariant to lax.
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`all_gather_invariant` differs from `all_gather` in the following ways:
* `all_gather_invariant` is `Varying -> Invariant`. For example:
`out: f32[8] = all_gather_invariant(inp: f32[4]{V: x}, 'x')` where the size of mesh axis `x` is `2`. While `all_gather` is `Varying -> Varying`.
* `all_gather_invariant` transposes to `dynamic_slice` which is `Invariant -> Varying`. While `all_gather` transposes to `reduce_scatter` which is `Varying -> Varying`.
PiperOrigin-RevId: 770746712
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Add
all_gather_invariantto lax.all_gather_invariantdiffers fromall_gatherin the following ways:all_gather_invariantisVarying -> Invariant. For example:out: f32[8] = all_gather_invariant(inp: f32[4]{V: x}, 'x')where the size of mesh axisxis2. Whileall_gatherisVarying -> Varying.all_gather_invarianttransposes todynamic_slicewhich isInvariant -> Varying. Whileall_gathertransposes toreduce_scatterwhich isVarying -> Varying.