..reads old-new data, optimized parallelization, few bugs fixed

..supports args:
`mol.type`, `filter`, `z`
added `verbose` for optional verbosity

..resolve some small conflict for 
`Read10X_Image()`

..adding of molecules to the object is optional `add.molecules = TRUE`

few small edits for cleaner code.

..inspired by [`SpatialFeatureExperiment`](https://github.com/pachterlab/SpatialFeatureExperiment) using`sf` package to work/filter segmentation geometries.
Updates:
- adding support to efficiently filter segmentation polygons (removing small artifacts etc..) 
  - added helper function `.filter_polygons()` (a bit modified version from `SpatialFeatureExperiment:::.filter_polygons`) for filtering given `min.area` - minimal polygon area as a threshold
- allow for multiple segmentation polygons per cell (..still using single z-plane)

..optimized parallelization `BiocParallel` for 
`.filter_polygons()`, ie using 2 workers less that total provided workers