Add classifiers table

[edgarrmondragon]

Closes #28

[edgarrmondragon]

This is an example query

select name, count(distinct package_name) from classifiers where name like 'Programming Language :: Python :: 3%' group by 1 order by 2 desc;

name	count(distinct package_name)
Programming Language :: Python :: 3	254803
Programming Language :: Python :: 3.8	99431
Programming Language :: Python :: 3.9	93880
Programming Language :: Python :: 3.7	86250
Programming Language :: Python :: 3.10	80917
Programming Language :: Python :: 3.6	78359
Programming Language :: Python :: 3.11	60005
Programming Language :: Python :: 3.5	46703
Programming Language :: Python :: 3.4	35560
Programming Language :: Python :: 3 :: Only	29212
Programming Language :: Python :: 3.12	26282
Programming Language :: Python :: 3.3	15959
Programming Language :: Python :: 3.2	5643
Programming Language :: Python :: 3.1	1498
Programming Language :: Python :: 3.13	1404
Programming Language :: Python :: 3.0	1083

[jonathan-s]

Also interested in getting this into the dataset.

[jonathan-s]

Also code looks good to me!

[edgarrmondragon]

Ping @sethmlarson :)

[sethmlarson]

I'll try seeing how this affects the database size.