Add new create builder overloads without callbacks

[jviau]

This PR introduces new create builder overloads for the client and worker with a slight difference. The existing overloads all take in a callback to configure the builder. The new overloads return the builder. This allows for a slightly cleaner HostApplicationBuilder experience. Some samples have also been updated to use HostApplicationBuilder and the new overloads.

Current style:

services.AddDurableTaskWorker(b =>
{ 
    b.Configure(...);
    b.AddTasks(...);
    b.UseGrpc();
});

New style:

services.AddDurableTaskWorker()
    .Configure(...)
    .AddTasks(...)
    .UseGrpc();

[cgillum]

LGTM. Glad to have this simplified setup experience. Thanks!