get id from handle and misc refactoring

[ehanson8]

What does this PR do?

In preparation for some major refactoring, this is a collection of miscellaneous changes from recent testing. They are described in the order that they appear in the diff

• Upgrades for Python 3.8
• Corrects attrs package name
• Creates a logs directory at startup if one doesn't already exist
• Removes search CLI command which was just used for initial testing
• Removes aux CLI group -This was not functioning as expected, I will revisit later after I finish the planned major refactoring
• Adds a method for retrieving an object's UUID based on a handle and a corresponding test
• Sorts bitstreams before posting to an item to ensure numbered bitstreams are in the correct order
• Refactors the 2 functions for creating JSON metadata from CSV to handle delimited fields containing multiple entries
• Updating testing variable names for greater clarity

Includes new or updated dependencies?

YES

[hakbailey]

The test changes are important because right now the tests aren't checking that all of the application logic works as expected. Everything else is just nonblocking suggestions :)