HookedSAETransformer

[ckkissane]

Description

Moving HookedSAETransformer from TransformerLens to SAELens, which I originally implemented here: https://github.com/TransformerLensOrg/TransformerLens/pull/536

Type of change

Please delete options that are not relevant.

• [ x] New feature (non-breaking change which adds functionality)
• [ x] This change requires a documentation update

Checklist:

• [ x] 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 unit 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 unit tests (acceptance tests not currently in use)

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

[jbloomAus]

Amazing! Just noting that I'm rebasing a refactor that supports this PR onto this PR so I will accept that PR when finished and close this one. It should show you as the author of those files in the history and do creditation properly.

[jbloomAus]

Closing this since it was already merged as part of the 3.0 refactor.