Fixes/#350 osm bld load assignment

[nesnoj]

Fixes #350

Improve building household load assignment:

• Extend OSM tags: regular building types and retirement and assisted homes
• Use commercial and retail buildings as fallback in populated cells without res. buildings
• Use building parts in hh load profile allocation instead of centroids: Buildings are clipped with census cells and resulting parts are now used for allocation instead of centroids only resulting in less synthetic buildings to be created. This reduced the total count of synth. buildings from 14k to 6.4k (SH run).
• Adjust the number of synth. buildings created in a cell: Use median of profile/building rate of adjacent cells instead of the global rate median to better represent the local conditions. This did not change the total count of synth. buildings (6.4k -> 5.6k) significantly but alters the regional distribution.
• Add table with household profile type counts per building

Before merging into dev-branch, please make sure that

• the CHANGELOG.rst was updated.
• new and adjusted code is formated using black and isort.
• the Dataset-version is updated when existing datasets are adjusted.
• the branch was merged into the
  continuous-integration/run-everything-over-the-weekend-branch.
• the workflow is running successful in test mode.
• the workflow is running successful in Everything mode.

[nesnoj]

This can be merged after a successful DE run