Add gen folder moving gen projects from src folder (#64231)

Author: maryamariyan

src/libraries/Microsoft.Extensions.Logging.Abstractions/Microsoft.Extensions.Logging.Abstractions.sln

@@ -1,9 +1,12 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.1.32111.311
+MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TestUtilities", "..\Common\tests\TestUtilities\TestUtilities.csproj", "{79CE8C7E-A4AF-413C-A54D-86F17073559C}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Extensions.Logging.Generators", "gen\Microsoft.Extensions.Logging.Generators.Roslyn3.11.csproj", "{1491B9C9-955D-4DB0-B1D5-70137A78EAAE}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Extensions.Logging.Generators.Roslyn3.11", "gen\Microsoft.Extensions.Logging.Generators.Roslyn3.11.csproj", "{1491B9C9-955D-4DB0-B1D5-70137A78EAAE}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Extensions.Logging.Generators", "gen\Microsoft.Extensions.Logging.Generators.Roslyn4.0.csproj", "{A5439E79-96D6-4F02-8DD0-23DFF979851D}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Extensions.Logging.Generators.Roslyn4.0", "gen\Microsoft.Extensions.Logging.Generators.Roslyn4.0.csproj", "{A5439E79-96D6-4F02-8DD0-23DFF979851D}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Extensions.Logging.Abstractions", "ref\Microsoft.Extensions.Logging.Abstractions.csproj", "{7F536552-0E2A-4642-B7CF-863727C2F9CD}"
 EndProject
@@ -23,6 +26,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{548DF5F7-790
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ref", "ref", "{7631380A-FB73-4241-9987-0891A21E9769}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "gen", "gen", "{03F31CEE-D63E-4E7F-949F-139B33DC3385}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -71,14 +76,14 @@ Global
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
 		{79CE8C7E-A4AF-413C-A54D-86F17073559C} = {4DE63935-DCA9-4D63-9C1F-AAE79C89CA8B}
+		{1491B9C9-955D-4DB0-B1D5-70137A78EAAE} = {03F31CEE-D63E-4E7F-949F-139B33DC3385}
+		{A5439E79-96D6-4F02-8DD0-23DFF979851D} = {03F31CEE-D63E-4E7F-949F-139B33DC3385}
+		{7F536552-0E2A-4642-B7CF-863727C2F9CD} = {7631380A-FB73-4241-9987-0891A21E9769}
+		{75C579F7-F20B-41F1-8CAF-641DE7ADA4EE} = {548DF5F7-790C-4A1C-89EB-BD904CA1BA86}
 		{C333EC5A-F386-4A01-AE20-12D499551304} = {4DE63935-DCA9-4D63-9C1F-AAE79C89CA8B}
 		{1CB869A7-2EEC-4A53-9C33-DF9E0C75825B} = {4DE63935-DCA9-4D63-9C1F-AAE79C89CA8B}
-		{1491B9C9-955D-4DB0-B1D5-70137A78EAAE} = {548DF5F7-790C-4A1C-89EB-BD904CA1BA86}
-		{A5439E79-96D6-4F02-8DD0-23DFF979851D} = {548DF5F7-790C-4A1C-89EB-BD904CA1BA86}
-		{75C579F7-F20B-41F1-8CAF-641DE7ADA4EE} = {548DF5F7-790C-4A1C-89EB-BD904CA1BA86}
-		{F8CF3192-B902-4631-972A-C405FDECC48D} = {548DF5F7-790C-4A1C-89EB-BD904CA1BA86}
-		{7F536552-0E2A-4642-B7CF-863727C2F9CD} = {7631380A-FB73-4241-9987-0891A21E9769}
 		{DAA1349E-960E-49EB-81F3-FF4F99D8A325} = {7631380A-FB73-4241-9987-0891A21E9769}
+		{F8CF3192-B902-4631-972A-C405FDECC48D} = {548DF5F7-790C-4A1C-89EB-BD904CA1BA86}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {450DA749-CBDC-4BDC-950F-8A491CF59D49}