fix tidy3d cache

[joamatab]

Fix cache

Summary

Bug Fixes:

• Fixed a bug where tidy3d S-parameter results were not being cached correctly.

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Reviewer's Guide by Sourcery

This pull request fixes the tidy3d cache by ensuring that the saved file has the correct ".npz" extension and updating the default component used for testing.

Sequence diagram for tidy3d cache handling

sequenceDiagram
    participant C as Component
    participant W as write_sparameters
    participant FS as FileSystem

    C->>W: Request write parameters
    W->>FS: Check filepath suffix
    alt filepath without .npz
        W->>W: Add .npz suffix
    end
    W->>FS: Check if file exists
    alt File exists and not overwrite
        FS-->>W: Load cached data
    else File doesn't exist or overwrite
        W->>W: Run simulation
        W->>FS: Save results
    end
    W-->>C: Return results

Loading

File-Level Changes

Change	Details	Files
Ensure correct file extension for cached simulations	Added a check to ensure that the filepath for saving simulation results always has a ".npz" extension. If the provided filepath does not have a ".npz" extension, it is updated to include one before saving the file.	gplugins/tidy3d/component.py
Update default component for testing	Changed the default component used for testing from a tapered waveguide to a straight waveguide. Removed several unused parameters from the write_sparameters function call in the test.	gplugins/tidy3d/component.py
Update .gitignore	Updated the .gitignore file to ignore specific files or directories. The specific changes are not detailed here as they are numerous and not relevant to the core change itself.	.gitignore

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