Converts dynesty checkpointing to use pickle instead of deepdish

1. Convert all hdf5 use to pickles
2. Also adds functionality to write the cache file on termination
3. Comments out two lines which seem to occasionaly break the read in

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• 0e2906a3 - Fix flake8 issue

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• 58ade21a - Extra fixes

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• 5c10e9eb - Fix flake8 issue

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mentioned in commit 6e249e8a