Update the `generateRoshanMessage` function to include Radiant/Dire percentages.

* **Add Radiant/Dire percentage calculation:**
  * Add `radiantPercentage` and `direPercentage` properties to the `RoshRes` interface.
  * Create `calculateRadiantDirePercentages` function to calculate Radiant/Dire percentages based on `minS` and `maxS`.
  * Update `generateRoshanMessage` function to call `calculateRadiantDirePercentages` and include the percentages in the message.
* **Update Roshan event handler:**
  * Add `radiantPercentage` and `direPercentage` properties to the `res` object in the Roshan event handler.
  * Update Redis storage to include the new properties.

#416

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