Parallelize Rust function apply_phase_shift_in_place

[kevinsung]

This function here: https://github.com/qiskit-community/ffsim/blob/1e555245473a7ba7e94b8324847417a0e4081bf3/src/gates/phase_shift.rs#L32

A straightforward attempt doesn't pass the compiler due to the use of unsafe BLAS functions.