Code formatting updates (#4502)

* Editorconfig: Add space_before_self_closing setting

This was a difference between the way dotnet-format and Rider format code. See https://www.jetbrains.com/help/rider/EditorConfig_Index.html

* Editorconfig: Keep 4 spaces indentation for Swagger JSON files

They are all formatted that way, let's keep it like that.

* Apply dotnet-format, mostly white-space related changes

BTCPayServer.PluginPacker/Program.cs

@@ -57,8 +57,8 @@ namespace BTCPayServer.PluginPacker
 
             var sha256sums = new StringBuilder();
             sha256sums.AppendLine(
-                $"{Encoders.Hex.EncodeData(Hashes.SHA256(Encoding.UTF8.GetBytes(json)))} {name}.btcpay.json"); 
-            
+                $"{Encoders.Hex.EncodeData(Hashes.SHA256(Encoding.UTF8.GetBytes(json)))} {name}.btcpay.json");
+
             sha256sums.AppendLine(
                 $"{Encoders.Hex.EncodeData(Hashes.SHA256(await File.ReadAllBytesAsync(outputFile + ".btcpay")))} {name}.btcpay");
 
@@ -68,7 +68,7 @@ namespace BTCPayServer.PluginPacker
                 File.Delete(sha256dirs);
             }
             await File.WriteAllTextAsync(sha256dirs, sha256sums.ToString());
-            
+
             // try Windows executable first, fall back to macOS/Linux PowerShell
             try
             {
@@ -86,7 +86,7 @@ namespace BTCPayServer.PluginPacker
                         $"Attempted to sign hashes with gpg but maybe powershell is not installed?\n{ex.Message}");
                 }
             }
-            
+
             Console.WriteLine($"Created {outputFile}.btcpay at {directory}");
         }