distribute_mesh: add more logpyle

[matthiasdiener]

Questions for the review:

• [ ] Is the scope and purpose of the PR clear?
  • [ ] The PR should have a description.
  • [ ] The PR should have a guide if needed (e.g., an ordering).
• [ ] Is every top-level method and class documented? Are things that should be documented actually so?
• [ ] Is the interface understandable? (I.e. can someone figure out what stuff does?) Is it well-defined?
• [ ] Does the implementation do what the docstring claims?
• [ ] Is everything that is implemented covered by tests?
• [ ] Do you see any immediate risks or performance disadvantages with the design? Example: what do interface normals attach to?

[majosm]

Might be good to add a timer for the partition_mesh step too, since that processing is potentially expensive. For the multi-volume case (i.e. when tag_to_elements is present), you could lump this code into it.

[MTCam]

Might be good to add a timer for the partition_mesh step too, since that processing is potentially expensive. For the multi-volume case (i.e. when tag_to_elements is present), you could lump this code into it.

done.