[Refactor]: standardization of messages appearance and error catching/presentation

[vforvilela]

1. Creation of a defaultResponse, so all commands start by invoking it:

   async handler(interaction: CommandInteraction): Promise<any> {
   const response = defaultResponse()
   const embed = response.embeds[0]
   const fields = embed.fields

2. The class CommandExceptionFilter is responsable to deal with exceptions not captured by the commands. 2.1. If it's a ValidationException (thrown by the class-validator) it presents it like this: Be my guess to change it. 2.2. It's a generic error, it shows a generic error: I shows the current status off each service, by calling the health end point. Again, change at will.

3. I tried to keep the icons as creative and as standard across commands as possible.

[MiguelMedeiros]

GREAT PR!!!! Thanks a lot!!!