Add build option to build a static lib

[WilliamTambellini]

Would you consider a PR to add an option to build statically (libx86simdsortcpp.a) ?
https://github.com/intel/x86-simd-sort/blob/87486d17a7d916f2992800b0219e28d0af29e765/meson.build#L37

[r-devulap]

@WilliamTambellini sure. Could you make it an optional meson argument that defaults to shared?