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.Client/Models/DepositAddressData.cs

@@ -6,10 +6,10 @@ public class DepositAddressData
     // * Example: P2PKH, P2SH, P2WPKH, P2TR, BOLT11, ...
     // */
     // public string Type { get; set; }
-    
+
     /**
      * Format depends hugely on the type.
      */
     public string Address { get; set; }
-    
+
 }