Use thin SVD in tsvd

[shinaoka]

In TSVD, we use QR + SVD. The SVD should use thin svd for better performance.
The current implementation of SVD in nalgebra does not have this option.

1. Contribute to nalgebra (PR)
2. Reimplement thin SVD in sparseir-rust

Option 1 should be better.

[shinaoka]

@mwallerb

Are you willing to implement this SVD yourself? If you don't, I (or Terasaki-san) will.