NEP: universal SIMD NEP 38 (#15228)
NEP: universal SIMD NEP 38 (#15228)

* NEP: propose SIMD NEP

* NEP: changes from review

* NEP: rename nep

jakirkham/numpy,jakirkham/numpy,grlee77/numpy,charris/numpy,anntzer/numpy,jakirkham/numpy,mattip/numpy,seberg/numpy,endolith/numpy,abalkin/numpy,simongibbons/numpy,seberg/numpy,charris/numpy,mattip/numpy,rgommers/numpy,endolith/numpy,numpy/numpy,simongibbons/numpy,seberg/numpy,charris/numpy,madphysicist/numpy,pbrod/numpy,numpy/numpy,endolith/numpy,madphysicist/numpy,abalkin/numpy,grlee77/numpy,seberg/numpy,pbrod/numpy,simongibbons/numpy,WarrenWeckesser/numpy,anntzer/numpy,pbrod/numpy,pbrod/numpy,pdebuyl/numpy,pdebuyl/numpy,jakirkham/numpy,madphysicist/numpy,rgommers/numpy,pdebuyl/numpy,WarrenWeckesser/numpy,mhvk/numpy,WarrenWeckesser/numpy,jakirkham/numpy,mhvk/numpy,grlee77/numpy,numpy/numpy,numpy/numpy,charris/numpy,mhvk/numpy,anntzer/numpy,simongibbons/numpy,mhvk/numpy,madphysicist/numpy,rgommers/numpy,pdebuyl/numpy,WarrenWeckesser/numpy,simongibbons/numpy,WarrenWeckesser/numpy,pbrod/numpy,grlee77/numpy,rgommers/numpy,madphysicist/numpy,grlee77/numpy,abalkin/numpy,mhvk/numpy,endolith/numpy,mattip/numpy,mattip/numpy,anntzer/numpy