fix: refactored flood to better behavior

[ErikBjare]

I've had this in my working tree for a while. Should be improved behavior better aligned with how aw-server-rust works. Will hopefully fix https://github.com/ActivityWatch/activitywatch/issues/626.

(Needs thorough review, long time since I wrote this, and can't remember what I've done)

[codecov[bot]]

Codecov Report

Merging #105 (0b47c01) into master (efd1325) will decrease coverage by 0.62%. The diff coverage is 69.56%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
- Coverage   90.78%   90.16%   -0.63%     
==========================================
  Files          34       34              
  Lines        1660     1687      +27     
  Branches      257      262       +5     
==========================================
+ Hits         1507     1521      +14     
- Misses        118      131      +13     
  Partials       35       35              

Impacted Files	Coverage Δ
aw_transform/flood.py	75.71% <69.56%> (-14.99%)	:arrow_down:

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[ErikBjare]

Since this is based on the aw-server-rust implementation, I just want to note that it might not be without issues either: https://github.com/ActivityWatch/activitywatch/issues/602