Migrates to solution file extension .slnx

Updates the solution file extension to `.slnx` to align with newer Visual Studio versions and support a more modern solution file format.

Updates git attributes and ignore file to reflect the solution extension change.

Author: niemyjski

.gitattributes

@@ -17,12 +17,12 @@
 #
 # Merging from the command prompt will add diff markers to the files if there
 # are conflicts (Merging from VS is not affected by the settings below, in VS
-# the diff markers are never inserted). Diff markers may cause the following 
+# the diff markers are never inserted). Diff markers may cause the following
 # file extensions to fail to load in VS. An alternative would be to treat
 # these files as binary and thus will always conflict and require user
 # intervention with every merge. To do so, just uncomment the entries below
 ###############################################################################
-#*.sln       merge=binary
+#*.slnx       merge=binary
 #*.csproj    merge=binary
 #*.vbproj    merge=binary
 #*.vcxproj   merge=binary
@@ -46,9 +46,9 @@
 
 ###############################################################################
 # diff behavior for common document formats
-# 
+#
 # Convert binary document formats to text before diffing them. This feature
-# is only available from the command line. Turn it on by uncommenting the 
+# is only available from the command line. Turn it on by uncommenting the
 # entries below.
 ###############################################################################
 #*.doc   diff=astextplain

.gitignore

@@ -4,7 +4,7 @@
 # User-specific files
 *.suo
 *.user
-*.sln.docstates
+*.slnx.docstates
 
 .vs
 *.lock.json
@@ -127,7 +127,7 @@ publish/
 # Publish Web Output
 *.[Pp]ublish.xml
 *.azurePubxml
-# TODO: Comment the next line if you want to checkin your web deploy settings 
+# TODO: Comment the next line if you want to checkin your web deploy settings
 # but database connection strings (with potential passwords) will be unencrypted
 *.pubxml
 *.publishproj

Exceptionless.RandomData.sln

@@ -0,0 +1,9 @@
+<Solution>
+  <Folder Name="/Solution Items/">
+    <File Path=".github/workflows/build.yml" />
+    <File Path="build/common.props" />
+    <File Path="README.md" />
+  </Folder>
+  <Project Path="src/Exceptionless.RandomData/Exceptionless.RandomData.csproj" />
+  <Project Path="test/Exceptionless.RandomData.Tests/Exceptionless.RandomData.Tests.csproj" />
+</Solution>