[shardformer] support sharded checkpointing IO for hybrid parallel plugin

[Fridge003]

Support checkpointing IO for hybrid parallel plugin, should handle tp/pp/zero properly. First complete the sharded case for both model and optimizer.

The feature to be implemented should include:

• Sharded saving of model: saving model to multiple files under the same checkpoint directory.
• Sharded loading of model: loading model from multiple files under the same checkpoint directory.
• Sharded saving of optimizer: saving optimizer to multiple files under the same checkpoint directory.
• Sharded loading of optimizer: loading optimizer from multiple files under the same checkpoint directory.

[Fridge003]

sharded model saving & sharded model loading completed: #4506