Otter-grader

* Added `ipython` to `install_requires`

* Added `MANIFEST.in`

* Display emojis with test results to more clearly show which tests pass and which fail, as per [533](https://github.com/ucbds-infra/otter-grader/pull/533).
* Allow users to specify a Python version in Otter Generate and Otter Assign
* Round `results.json` point values to 5 decimal places per [538](https://github.com/ucbds-infra/otter-grader/issues/538)
* Optionally display PDF generation/submission failures to students via `results.json` per [494](https://github.com/ucbds-infra/otter-grader/issues/494)
* Added the `force_public_test_summary` key to the autograder config per [539](https://github.com/ucbds-infra/otter-grader/issues/539)
* Made the "Public Tests" section on Gradescope appear as failing when not all public tests passed per [539](https://github.com/ucbds-infra/otter-grader/issues/539)

* Close temporary file handle before removal when checking tests in `otter.Notebook.export`
* Fixed bug caused by unspecified encoding in Windows JSON loads per [524](https://github.com/ucbds-infra/otter-grader/issues/524)
* Updated autograder zip `setup.sh` file and `r-base` version per [514](https://github.com/ucbds-infra/otter-grader/issues/514)
* Fix point value filtering for student tests in Otter Assign per [503](https://github.com/ucbds-infra/otter-grader/issues/503)

* Fix Otter Grade Dockerfile per [517](https://github.com/ucbds-infra/otter-grader/issues/517)
* Fix display of Public Tests output on Gradescope due to new output format
* Updated Otter Export to only import the HTML exporter and its dependencies when an HTML export is indicated per [520](https://github.com/ucbds-infra/otter-grader/issues/520)

* Added a new test file format based on raising exceptions per [95](https://github.com/ucbds-infra/otter-grader/issues/95)
* Refactored execution internals to remove mocks and AST parsing
* Added use of `tempfile` to store the executed source for compilation per [229](https://github.com/ucbds-infra/otter-grader/issues/229)
* Added use of `wrapt` for `otter.Notebook` method decorators
* Set `export_cell: run_tests: true` and `check_all_cell: false` as new defaults for Otter Assign per [378](https://github.com/ucbds-infra/otter-grader/issues/378)
* Made the v1 format of Otter Assign the default and added the `--v0` flag to the CLI
* Converted logging in some of Otter's tooling from `print` statements to the `logging` library, and added verbosity flags to each command
* Updated containerized grading to better handle grading single files
* Made Otter compatible with Jupyterlite per [458](https://github.com/ucbds-infra/otter-grader/issues/458)
* Added Otter Assign R Markdown format v1 per [491](https://github.com/ucbds-infra/otter-grader/issues/491)
* Refactored Otter Assign internals per [491](https://github.com/ucbds-infra/otter-grader/issues/491)
* Converted user-supplied configuration management and documentation to `fica` per [485](https://github.com/ucbds-infra/otter-grader/issues/485)
* Added assignment names to Otter Assign and Otter Generate that can be verified by Otter Run to prevent students from submitting to the wrong autograder per [497](https://github.com/ucbds-infra/otter-grader/issues/497)
* Set the default version of `ottr` to v1.2.0