Improve water consumption messages

The plugin now presents the user with textual information that compare their LLMs water consumption usage to daily scenarios (e.g.: "as much water as watering a small plant"). Messages could be improved both in terms of possible comparisons, language, use of emojis, etc.

This enhancement can be done by people with zero to little coding experience and is suitable for the creative minds.

The messages are currently defined in popup.js using the following structure:

const comparisons = [
  { max: 0.005, label: "a teaspoon of water 🫖" },
  { max: 0.015, label: "a tablespoon of water 🥄" },
  { max: 0.25, label: "watering a small plant 🌿" },
  { max: 0.5, label: "brushing your teeth with the tap off 🪥" },
  { max: 1, label: "drinking a large glass of water 🥛" },
  { max: 3, label: "washing your hands quickly 🧼" },
  { max: 6, label: "a modern toilet flush 🚽" },
  { max: 10, label: "a 1-minute shower 🚿" },
  { max: 30, label: "washing dishes by hand 🍽️" },
  { max: 60, label: "a short 5–7 minute shower 🚿" },
  { max: 90, label: "a full load in the washing machine 🧺" },
  { max: 150, label: "a filled bathtub 🛁" },
  { max: 300, label: "watering a medium garden 🌱" },
  { max: 500, label: "washing a car with a hose 🚗" }
];