Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
• update tests and/or documentation
• other (please add here)

Closes #1839. Closes #1849.

Changelog

What are the changes made in this PR?

• Delete ChatFormat, InstructTemplate, and all references
• Delete torchtune/data/_converters.py. These are replaced by the transforms in _messages.py
• Delete the old dataset tutorial. All topics have already been covered in Basics section of documentation, and the tutorial refers to outdated APIs. Only sample packing was still new, so I moved that to its own section under Basics.
• Update generate recipe to assume single prompt string and no chat format or instruct template since the prompt template is now defined on the tokenizer.

Test plan

Please make sure to do each of the following if applicable to your PR. If you're unsure about any one of these just ask and we will happily help. We also have a contributing page for some guidance on contributing.

• run pre-commit hooks and linters (make sure you've first installed via pre-commit install)
• add unit tests for any new functionality
• update docstrings for any new or updated methods or classes
• run unit tests via pytest tests
• run recipe tests via pytest tests -m integration_test
• manually run any new or modified recipes with sufficient proof of correctness
• include relevant commands and any other artifacts in this summary (pastes of loss curves, eval results, etc.)

UX

If your function changed a public API, please add a dummy example of what the user experience will look like when calling it.
Here is a docstring example
and a tutorial example

• I did not change any public API
• I have added an example to docs or docstrings