Enhance the API to load and store vectors to and from `MemorySegment`s
  as defined by [JEP 424: Foreign Function & Memory (FFM) API
  (Preview)][JEP-424]. The FFM API is sufficiently mature that we are
  comfortable adding this dependency to the Vector API. We will remove
  equivalent API points that operate on `byte[]` and `ByteBuffer`, since
  a `MemorySegment` can be obtained for either. Use of `MemorySegment`s
  will enable the creation of *hyper-aligned* regions of memory, which
  align to the byte length of a vector. On some architectures, such
  alignment enables superior performance when loading and storing
  vectors.