fix(python): detect deltalake version in show_versions #7622
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I noticed that we did not pick up the version of the optional deltalake dependency, as per delta-io/delta#1339.
Solved this using importlib.metadata. This standard library function is not availble for Python 3.7, but I dont think it is worth adding the backport for that given Python 3.7 support may soon be dropped and there is no significant loss in functionality to end users.