Apply traits to operations

[yasahi-hpc]

Improves #80

This PR aims at applying new traits from KokkosFFT_traits.hpp to unary (fftshift, ifftshift) and binary (Plan and fft functions) operations.

Static assertions are applied to Unary and Binary APIs.

• Introduce is_view_operatable_v for Unary operation (Views can be accessible from Execspace and the base value types are float/double/Kokkos::complex<float>/Kokkos::complex<double>. In addition, layout is either Kokkos::LayoutLeft or Kokkos::LayoutRight.
• Introduce are_views_operatable_v for Binary operation (Both Views are operatable and have the same precision, layout and rank)
• Introduce have_same_base_floating_point_type_v for Binary operation (the values have the same base floating point type. For example, float and Kokkos::complex<float> have the same base floating point type)
• Introduce have_same_layout_v for Binary operation
• Introduce have_same_rank_v for Binary operation
• Apply are_views_operatable_v to binary APIs. Exec space and memory space consistency, precision consistency, layout consistency and rank consistency.
• Apply is_view_operatable_v to unary APIs. Exec space and memory space consistency.