Feature request: Enable filtering of get_my_collections()

[AliceBalfanz]

After having instantiated a geoDB client, I can view my collections. It would be great to be able to filter the results by different values for the columns, e.g. filter the output to only show positions where the database is public, or has a certain owner.
Currently one cannot filter at all:

from xcube_geodb.core.geodb import GeoDBClient

geodb = GeoDBClient()

ds = geodb.get_my_collections()
ds

For example, it would be nice to filter by passing a dict with the columns and the values to be used for filtering or something similar
ds = geodb.get_my_collections(filter={'database':'public'})