[PYSPARK] add picklable SparseMatrix in pyspark.ml.common

## What changes were proposed in this pull request?

add `SparseMatrix` class whick support pickler.

## How was this patch tested?

Existing test.

Author: WeichenXu <WeichenXu123@outlook.com>

Closes #14265 from WeichenXu123/picklable_py.

python/pyspark/ml/common.py

@@ -51,6 +51,7 @@ py4j.protocol.smart_decode = _new_smart_decode
 _picklable_classes = [
     'SparseVector',
     'DenseVector',
+    'SparseMatrix',
     'DenseMatrix',
 ]