[Templates] Create a `dotnet new` project template of authentication server

[xperiandri]

Confirm you've already contributed to this project or that you sponsor it

• [X] I confirm I'm a sponsor or a contributor

Describe the solution you'd like

With some simple configurability reusing server sample as a source of the template.

My company can prepare a PR if you approve.

Additional context

Related #1446

[kevinchalet]

When I started working on OpenIddict, there was a strong demand for templates. I've never been completely opposed to that, but it's extremely important to note that maintaining templates in the long term is extremely expensive given all the combinations folks would like to see supported:

• With and without consent pages.
• With and without authorization code flow support.
• With and without implicit flow support.
• With and without hybrid flow support.
• With and without resource owner password credentials grant support.
• With and without client credentials grant support.
• With and without device authorization grant support.
• With and without refresh token grant support.
• With and without ASP.NET Core Identity.
• With and without delegated OIDC/OAuth 2.0 authentication/pseudo-authentication.
• With and without Integrated Windows Authentication.
• With and without Entity Framework Core.
• With and without local validation.
• With and without introspection.

So not a strong "no" but a "let's wait to see how we can fund this work item to make it viable in the long term" (e.g should that be a sponsors-only or paid feature?)