feat: support interruptionLevel for iOS

[vonovak]

the push service now supports the interruptionLevel field: see https://developer.apple.com/documentation/usernotifications/generating-a-remote-notification#Payload-key-reference

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (095bf15) to head (0540771).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #106   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          168       168           
  Branches        33        33           
=========================================
  Hits           168       168           

Flag	Coverage Δ
node_18	100.00% <ø> (ø)
node_20	100.00% <ø> (ø)
node_22	100.00% <ø> (ø)

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