Error handling in DiscordBotStartupService

[fpindej]

Problem

When the bot starts here, You are at mercy of everything being set up correctly. That's far from optimal.

Solution suggestion

• try-catch in await _client.LoginAsync(TokenType.Bot, _clientToken); and await _client.StartAsync();
• log a valid error message
• either introduce some retry mechanism or end the application gracefully

[fpindej]

Big problem with this is that the Discord.NET library isn't exactly friendly and logs the exception instead of throwing it. Will have to figure this one out later.