urllib.parse to handle user filter

[simroux]

I think it may be worth using urllib.parse to handle the filters that users can enter as arguments, in case these include spaces or other special characters (which I did by mistake :-D ). This could look something like:

import urllib.parse
...
if filter != "":
       filter = urllib.parse.quote_plus(filter)
url = f"{api_client.base_url}/nmdcschema/{collection_name}?filter={filter}&page_size={max_page_size}&projection={fields}"