Update code for latest nightly builds

[NycroV]

A couple of noteworthy changes here:

• Reflection is no longer used to hook events - the handlers are now triggered through a transient service as part of DSharpPlus' new event handler implementations

• Connected shard count retrieval still has default implementations, but if an end-user is using a custom IShardOrchestrator implementation, for the most accurate shard count retrieval they should supply their own Task.

Example:
builder.Services.Configure<DiscordClientWrapper>(wrapper => wrapper.GetShardCount = () => YourTask());

Additionally, if your shard count retrieval needs to make asynchronous calls:
builder.Services.Configure<DiscordClientWrapper>(wrapper => wrapper.GetShardCount = async () => await YourTaskAsync());

Obviously you can skip the lambda expressions and directly insert the method name, but I used lambda here to make it more obvious what's actually being done.

This won't be relevant for 99% (if not 100%) of users, as D#+'s default implementations are usually more than fine enough. However, I'm still going to reach out to D#+ to see about implementing a connected shard count property or method on the IShardOrchestrator interface. This would allow us to forego all of this extra roundabout retrieval and directly access the counts without the need for any additional configuration from end users.

[akiraveliara]

This won't be relevant for 99% (if not 100%) of users, as D#+'s default implementations are usually more than fine enough. However, I'm still going to reach out to D#+ to see about implementing a connected shard count property or method on the IShardOrchestrator interface.

hej, D#+ maintainer here - this will be available shortly: DSharpPlus/DSharpPlus#2068

[NycroV]

Once the DSharpPlus PR has been merged and published, all that needs to be changed is updating the L4N .csproj information to use the latest nightly package, and then this PR will be ready to merge.

Thanks @akiraveliara for the speedy response and implementation!

[NycroV]

DSharpPlus package has been updated and this PR is now ready to merge!

[angelobreuer]

Thank you 🚀