Introduction to vectorization with Vector128 and Vector256 (#84115)

Co-authored-by: Günther Foidl <[email protected]>
Co-authored-by: Dan Moseley <[email protected]>
Co-authored-by: Rob Hague <[email protected]>
Co-authored-by: Tanner Gooding <[email protected]>
Co-authored-by: Stephen Toub <[email protected]>
Co-authored-by: Jeff Handley <[email protected]>

Author: 7 people