[improve] handle KeyError for Notion source

[AstrakhantsevaAA]

Currently, Notion pipeline fetches data from databases. If we wish to fetch data from custom databases, it requires input like:

selected_database_ids = [{"id": "dfgs", "use_name": "ddf"}] 

However, if we omit the use_name, it results in a KeyError.

TODO:
If the use_name isn’t supplied, the code will automatically fetch it from Notion. For instance, you can input:

selected_database_ids = [{"id": "fllff"}]

And the system will retrieve the corresponding use_name directly from Notion. It’s a minor adjustment, but I believe it eases user experience.( for me it did)
Before this change, only providing a database ID without the use_name would lead to an error. This modification should make the process more user-friendly.

[dat-a-man]

PR created : #242

[rudolfix]

we should convert Notion into a source that is like our sql_database or incoming Mongo/Airtable where you select databases, then tables and configure them for sync...