Feature Request: ephemeral messages support

[timbru31]

I'd like to request the following feature:
Make the bot requests ephemeral, i.e., private responses.

According to the Discord documentation at https://discord.com/developers/docs/interactions/slash-commands#interaction-response, we'd need to pass flags: 64 in the data object here: https://github.com/GEMISIS/discord-bot-cdk-construct/blob/main/src/functions/DiscordBotFunction.ts#L43

Preferable this flag would be user controlled, i.e, setting a variable when making a new DiscordBotConstruct.

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This should probably be achievable with custom stack properties and then passing those as env variables to the lambda.

[GEMISIS]

Hmm... this will need to have some design considerations I think, as there will likely be some commands that you want to be ephemeral and some that you do not. I'll take a look into how this can be done.