[memoization 8/n] make default fs io manager memoizable
This diff makes the default fs io manager subclass MemoizableIOManager. This further decreases the friction users will encounter when they try to use memoization.
If this goes through, we can probably get rid of versioned_fs_io_manager. The question for me is whether we might want to preserve it for backcompat, or given the experimental-ness of all the memoization stuff, just force people to migrate.
Test Plan: Added additional unit test for memoization mode
Reviewers: sandyryza, alangenfeld
Reviewed By: sandyryza
Differential Revision: https://dagster.phacility.com/D9085