Fix filtering of verify and should fix #1488

[bammab]

Hi,
I run in the same problem as the user of issue #1488 and this PR should fix the bug. Because none of the json files have a version field, I was first looking where this field come from. A review with git blame of verify.py don't helped a lot and I'm not sure, how this code should ever work.

1. The json content is passed unchanged to the filter, but the Package class create specific release/metadata dicts with other contents/fields - here we could find the "version" field.
2. The filters are called without any condition on the result. So the check seems to be useless?!

To fix that, I wrapped the json package inside a Package class object and call the same functions as the mirror class do and it seems to work as expected.

Please check my PR. If I had made any mistakes or I don't understand how it should work, I will promise to fix that ASOP.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 83.51%. Comparing base (4d020e8) to head (a65252d).
Report is 175 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bandersnatch/verify.py	12.50%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1690      +/-   ##
==========================================
+ Coverage   79.69%   83.51%   +3.82%     
==========================================
  Files          31       31              
  Lines        4324     4332       +8     
  Branches      780      780              
==========================================
+ Hits         3446     3618     +172     
+ Misses        721      527     -194     
- Partials      157      187      +30     

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[cooperlees]

Hi,

Thanks for the PR. This seems like this should work. I wonder if we could somehow add a test to show verify respecting some simple filter options now you've added support? They would extend here

Thanks!