Update Roshan kill message to include Radiant/Dire percentages

[Geczy]

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.

https://github.com/dotabod/backend/issues/416

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