[LangGraph] Add Optional Sharding Support

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?
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      Context

      As requested in https://github.com/langchain-ai/langchain-mongodb/issues/117, we can enable sharding support by having an optional shard_key parameter in our checkpointer, which has the effect of running shardCollection on each of the collections used by the checkpointer.

      Sample code:

      # Enable sharding on the database  
database_name = 'your_database'  
client.admin.command('enableSharding', database_name)  
  
# Shard the collection  
collection_name = 'your_collection'  
shard_key = {'your_shard_key': 1}  # Specify your shard key  
client.admin.command('shardCollection', f'{database_name}.{collection_name}', key=shard_key)

      Definition of done

      Enable the feature and test with local and remote Atlas.

      Pitfalls

      None

            Assignee:
            Steve Silvester
            Reporter:
            Steve Silvester
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              Created:
              Updated:
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