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**Description**
Unify metric names of benchmarks.

**Description**
Set reduce type for current benchmarks' metrics, including model benchmarks and ShardingMatmul.

**Description**
Replace `sum(results) / len(results)` with `statistics.mean(results)`

Benchmarks: Add Feature - Add DistributedImpl and DistributedBackend arguments for micro benchmark. (#100)

* Change default shape of sharding-matmul.

Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>

Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>

Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>

Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>

Benchmarks: Add Benchmark - Add op-sharding microbenchmark, including matmul and sharding_matmul. (#36)

* add microbenchmark - sharding matmul.
* address comments.
Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>