[WIP] Drop batch processing and store encountered advisories

[sbs2001]

This PR simplifies the code to insert the data into db by doing single inserts instead of bulk inserts.
To avoid doing duplicate work, all encountered advisories are stored. See the models for details.

TODOs :

• Fix tests
• Detect conflicts and log them
• Improve speed further, by using batch inserts for inserting the advisory objects. And leverage some heuristics. (This is waaay simpler and low hanging fruit to imporve perf)

Signed-off-by: Shivam Sandbhor shivam.sandbhor@gmail.com

[sbs2001]

This is doing too many things at a time, I;m breaking it into smaller parts