feat: improve write perfromance of DeltaFileSystemHandler
#943
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Description
This PR builds in top of the changes to handling the runtime in #933. In my local tests this fixed #915. Additionally, I added the runtime as a property on the fs handler to avoid re-creating it on every call. In some non-representative tests with a large number of very small partitions it cut the runtime in about half.
cc @wjones127
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Documentation