Create a benchmark for AreaWeighted regridder memory

[pp-mo]

The issue fixed in #5767 should really have an associated benchmark.

Unfortunately it seems from @stephenworsley experiment that the current
It also looks like switching to tracemalloc would probably fix this -- i.e. enable us to see this kind of inefficiency.

[github-actions]

In order to maintain a backlog of relevant issues, we automatically label them as stale after 500 days of inactivity.

If this issue is still important to you, then please comment on this issue and the stale label will be removed.

Otherwise this issue will be automatically closed in 28 days time.

[github-actions]

This stale issue has been automatically closed due to a lack of community activity.

If you still care about this issue, then please either:

• Re-open this issue, if you have sufficient permissions, or
• Add a comment stating that this is still relevant and someone will re-open it on your behalf.