Add WaterCustomAmountEvent and updated water capability

[edenhaus]

Fixes #1046

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.74%. Comparing base (7e33b75) to head (52914bb).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1100      +/-   ##
==========================================
+ Coverage   93.72%   93.74%   +0.01%     
==========================================
  Files         131      131              
  Lines        5020     5034      +14     
  Branches      327      332       +5     
==========================================
+ Hits         4705     4719      +14     
  Misses        252      252              
  Partials       63       63              

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[codspeed-hq]

CodSpeed Performance Report

Merging #1100 will not alter performance

_{Comparing customWaterAmount (52914bb) with dev (7e33b75)}

Summary

✅ 6 untouched benchmarks

[milch]

It looks like you updated one of the bots, FYI the 9eamof (T80) also uses the custom water amount