Add filters in notifications endpoint

[rodolfomiranda]

This PR address issue #266 . It adds to NotificationCollectionEnd three optional query parameters

• read to filter by the read property of the note (true or false).
• route to filter by the route r property in the attributes section (a) if exists.
• order to order the results by datetime in asc or desc order.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.11%. Comparing base (18d3ad7) to head (50543d8). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #267 +/- ## ========================================== + Coverage 93.06% 93.11% +0.04% ========================================== Files 36 36 Lines 7121 7243 +122 ========================================== + Hits 6627 6744 +117 - Misses 494 499 +5 ```

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[lenkan]

Very helpful feature!

Question: I am not familiar with the notifier implementation, but this looks like it would load all notes in to memory, then filter them? Would it make sense to instead implement the filtering in keripy, utilizing the iterator to avoid loading all notes into memory?

[rodolfomiranda]

That's a good point. The optimal way is to implement it in keripy but it needs to run the iterator also on the countAll function. However, for the order part we still need to get them all in memory before pagination. I can move it there easily, but I need the feedback from others specially @pfeairheller. If we are in agreement, I'll adapt this one and create a onother in keripy.