[Reshard] Support r to s of unbalanced split #56149
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Description
Pcard-73145
支持Replicate到非均匀切分Shard的状态转换，以4卡为例，输入输出都是一维process_mesh，[0, 1, 2, 3]，输入为二维Replicated状态，in_tensor_shape = [6, 9]，in_dims_mapping = [-1, -1]，输出为二维Shard状态。