Is your feature request related to a problem or challenge? Please describe what you are trying to do.

The flatbuffer specification recommends that buffers are aligned to 64-bit boundaries, however, this is not mandated. Additionally when loading a flatbuffer from an in-memory source, it is possible the source buffer itself isn't aligned.

We already re-align interval buffers, we should do this consistently

Describe the solution you'd like

We should automatically re-align mis-aligned IPC buffers

Describe alternatives you've considered

Additional context

Relates to #4254 which would likely produce mis-aligned buffers