Add script to empirically measure bandwidth for roofline #17

[nchristensen]

No description provided.

[kaushikcfd]

Thanks! Some initial comments:

• We should pass the lint CI on this.
• This should hook into the current feinsum machinery where the device peak is pulled instead of an executable in the source tree.
  • I'm hoping with this the proposed patch will be picked up by the code paths CI as well.
• [Minor] Better commit messages, otherwise, all the commits might get squashed. Typically commit boundaries that are good checkpoints for git-bisect are good options.

[nchristensen]

Yeah, the changes for each commit are pretty incremental so they can probably be squashed.