Implement /temperature command

[Heixier]

Issue Title: Implement /temperature command

Issue Description: As a user of our Discord bot, I want to be able to convert between temperatures without having to leave the Discord app.

Feature Description:

• The "/temperature" command should take an integer as an option, a predefined choice of Kelvin, Fahrenheit, or any other temperature scale, before finally taking in an optional choice of whether it should be reversed.
• If the reverse option is used, the bot replies with Celsius converted to the selected temperature scale, instead of converting from it to Celsius.
• The bot should respond to the user directly within the Discord channel where the command was invoked.

Acceptance Criteria:

• The "/temperature" command is successfully implemented and tested.
• Invoking the "/temperature" command should result in the bot converting temperatures correctly with and without the optional reverse option.
• The bot's response should state the temperature of the original temperature scale, as well as the converted temperature. Do remember that when the reverse option is used, the original temperature scale will be Celsius instead.

Additional Notes:

• This feature will provide users with the ability to more easily converse with people who use different temperature scales.
• Please ensure thorough testing of the "/temperature" command functionality before closing this issue.