Add hlo_sharding_util::MoveAndMergeShardingTiles.
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Given a tiled sharding, move the tiles from source_dim and merge it into target_dim. For example, given a sharding with tile assignment `[a, b, c, d, e]`, source_dim = 1, target_dim = 3, the function will return a sharding with tile assignment `[a, 1, c, db, e]`. PiperOrigin-RevId: 694580468
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Add
hlo_sharding_util::MoveAndMergeShardingTiles.Given a tiled sharding, move the tiles from source_dim and merge it into
target_dim. For example, given a sharding with tile assignment
[a, b, c, d, e], source_dim = 1, target_dim = 3, the function will return a sharding withtile assignment
[a, 1, c, db, e].