[REQUEST] Adding icon_url property for api.model.team.Application

[B1ue-Dev]

Describe the feature.

Describe the issue

Currently, the only way to get the Application icon is manually getting the icon hash from icon and assign it into a link. My Pull Request will add a property method for doing this. For example, self.bot.me.icon_url.

Code of Conduct

• I agree to follow the contribution requirements.

[B1ue-Dev]

Merged done. Forgot to close this lol.