Fix race condition, and add pool support to store. #21
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Applying langchain-ai/langgraph#2494. Replaces #20.
In that PR, a pool is created through arguments passed into the
from_conn_string
method of the store, but I've opted for the time being to leave that out and require pool creation first before passing it into the constructor of the store. This is what is needed currently for the checkpointer. I'm keeping it like this for now in case this difference upstream needs to be sorted out in the future.