[FEATURE REQUEST] Metadata export

[LdDl]

Is your feature request related to a problem? Please describe.
In some situations it is needed more data from OSM tags/attributes such as: lanes number on a road, max speed restrictions, bus lanes, traffic lights and etc.

Describe the solution you'd like and provide pseudocode examples if you can

1. Add optional flag export_meta (default value is false)
2. If export_meta is true then export all processed tags/attirubutes to %filename_placeholder%_metainfo.csv
3. Proposed format:

type                    | object_id             | jsoned_tags_and_attributes

(either node or way)    | OSM object ID         | map[string]string of tag key/values pairs

Additional context
Any other suggestions are welcome