Lightweight notification manager that aggregates/throttles notifications for low-end phones

@akreana_ @LeeThobela @mqondisi_brian @sbu_sbuda90174 @MandisLush @OupaGedions @_tomi24 @ShalewaForeign @lynnessa08 @leramodumane Lmao 🤣🤣🤣 You're gonna force me to get a new phone. The current one is struggling with the notifications. Now I imagine what kind of device you must really be using