Add empty .NET MAUI Blazor template

[danroth27]

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We added empty Blazor Server and Blazor WebAssembly templates. We should probably do the same for .NET MAUI Blazor.

[jfversluis]

@davidortinau is this something we actually want to do? If so, when and how?

[danroth27]

The .NET MAUI Blazor template has the default content form the other Blazor web templates, so there's a bit more to delete than with the plain .NET MAUI template. The default content is useful for folks trying out the technology for the first time, but once we get broader adoption (🤞) we expect to get feedback that the default content is annoying to have to remove each time.

[mkArtakMSFT]

@danroth27 we should also take a wider look at what templates should we have for Blazor Hybrid (@Eilon brought this up).

[Eilon]

Fixed in #23615