Move `mesh_resolution_hint` from `PhysicalProperties` to `primitive_info`

[nepfaff]

Currently, Drake's mesh_resolution_hint is part of PhysicalProperties. However, a reasonable value is likely primitive-type dependent. Consequently, it would make more sense to have it as part of the per primitive primitive_info than as part of the global PhysicalProperties.

To reduce primitive info file sizes, another option would be to define a resolution hint per primitive type somewhere. However, this seems less clean with the current philosophy that all settings should be exposed in the experiment descriptions.