Add codespell to pre-commit hooks and fix spelling of existing files (#1161)

* fixed spelling, minor errors and reformatted using black

* polishing

* added codespell to pre-commit hooks, fixed a number of spelling errors and a few minor bugs in the code

* update autogen library version in notebooks

* update autogen library version in notebooks

* update autogen library version in notebooks

* update autogen library version in notebooks

* update autogen library version in notebooks