Ideas for better Notion Loader: Add optional Filter to load only specific documents

[MarkusOdenthal]

I have a huge Notion Database for my Second Brain, and I think others do as well. To extract only specific pages from a database, it would be nice to add a filter parameter (only optional).

I can do it, if you want.

[jerryjliu]

@MarkusOdenthal that would be amazing if you wanted to contribute a PR!