chore(testdata): add fseq.json under silero testdata for future test enhancements

[crutcher]

Partially unpacked cuda vs flex crosstest. The CUDA error is in the FusedLstm code.

$ cargo test --package bunsen --lib --features cuda -- kits::speech::silero_vad::cross_test::tests::backend_golden_crosstest --exact
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.52s
     Running unittests src/lib.rs (target/debug/deps/bunsen-38988ac2e73a0fdf)

running 1 test
test kits::speech::silero_vad::cross_test::tests::backend_golden_crosstest ... FAILED

failures:

---- kits::speech::silero_vad::cross_test::tests::backend_golden_crosstest stdout ----
unrolled::frame_features
unrolled::lstm_step

thread 'kits::speech::silero_vad::cross_test::tests::backend_golden_crosstest' (969848) panicked at crates/bunsen/src/kits/speech/silero_vad/cross_test.rs:127:14:
Tensors are not approx eq:
  => Position 0: 0 != -0.7615942
     diff (rel = +1.00e0, abs = +7.62e-1), tol (rel = +5.00e-3, abs = +1.00e-5)
  => Position 8: 0 != -0.7615942
     diff (rel = +1.00e0, abs = +7.62e-1), tol (rel = +5.00e-3, abs = +1.00e-5)
  => Position 11: 0 != 0.7615942
     diff (rel = +1.00e0, abs = +7.62e-1), tol (rel = +5.00e-3, abs = +1.00e-5)
  => Position 12: 0 != -0.7615942
     diff (rel = +1.00e0, abs = +7.62e-1), tol (rel = +5.00e-3, abs = +1.00e-5)
  => Position 16: 0.7615942 != 0
     diff (rel = +1.00e0, abs = +7.62e-1), tol (rel = +5.00e-3, abs = +1.00e-5)
52 more errors...
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    kits::speech::silero_vad::cross_test::tests::backend_golden_crosstest

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 262 filtered out; finished in 1.44s

error: test failed, to rerun pass `-p bunsen --lib