feature: MAUI Support

[stevefan1999-personal]

Is your feature request related to a problem? Please describe.
There is an error regarding to use Pharmacist on MAUI

1>C:\Users\steve\.nuget\packages\pharmacist.msbuild\1.9.1\buildTransitive\netstandard2.0\Pharmacist.MSBuild.targets(48,5): error : Neither TargetFramework nor ProjectTypeGuids have been correctly set.
1>Done building project "MauiWithGraphQL.csproj" -- FAILED.
1>C:\Users\steve\.nuget\packages\pharmacist.msbuild\1.9.1\buildTransitive\netstandard2.0\Pharmacist.MSBuild.targets(48,5): error : Neither TargetFramework nor ProjectTypeGuids have been correctly set.

Although TargetFrameworks is well set:

	<PropertyGroup>
		<TargetFrameworks>net6.0-ios;net6.0-maccatalyst</TargetFrameworks>
		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net6.0-windows10.0.19041.0</TargetFrameworks>

Describe the solution you'd like

To have seamless integration of MAUI

Describe alternatives you've considered
Just manually rewrite the events

[mysteryx93]

I'm having the same problem in an Avalonia project.

I have this in my csproj

    <TargetFramework>net6.0</TargetFramework>
    <ProjectTypeGuids>{60DC8134-EBA5-43B8-BCC9-BB4BC16C2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>

[glennawatson]

We won't be extending support, pushing instead ReactiveMarble.ObservableEvents

I've noted the issues you've been having @mysteryx93 over there and hoping for some time this weekend to fix them.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.