feat: Add support for dataset name in PretokenizeRunner

[keltin13]

Description

PretokenizerRunner doesn't support datasets name argument. Usually you can get around this by specifying the data_dir, but supporting this argument brings the interface more in line with the datasets interface. Additionally, the column name was previously not being tracked in the metadata, and now is. Finally, a pretokenizer test was using pretokenize_runner instead of PretokenizerRunner, which was deprecated, and has now been upgraded.

Summary of updates:

• Added optional dataset name parameter
• Updated metadata to track dataset name and column name
• Added test for loading dataset with name argument and checking metadata
• Updated tests to use PretokenizeRunner instead of depricated pretokenizer_runner

Dependencies:

• Loads new (but small) dataset from HF for tests

Fixes # (issue)

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• I have not rewritten tests relating to key interfaces which would affect backward compatibility

You have tested formatting, typing and tests

• I have run make check-ci to check format and linting. (you can run make format to format code if needed.)