adds batchtopk to architecture choices

[anthonyduong9]

Description

Adds "batchtopk" to choices for the --architecture arg in the training CLI. We want to be able to train BatchTopK SAEs using the CLI, and didn't add the logic for this in #505.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

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.)

Performance Check.

If you have implemented a training change, please indicate precisely how performance changes with respect to the following metrics:

• L0
• CE Loss
• MSE Loss
• Feature Dashboard Interpretability

Please links to wandb dashboards with a control and test group.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.53%. Comparing base (7ceb4ab) to head (620c017).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #508   +/-   ##
=======================================
  Coverage   85.53%   85.53%           
=======================================
  Files          28       28           
  Lines        3587     3588    +1     
  Branches      448      448           
=======================================
+ Hits         3068     3069    +1     
  Misses        336      336           
  Partials      183      183           

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[chanind]

oops great catch!