Add CA2000 rule to .editorconfig with warning severity

Updated .editorconfig to include a new rule enforcing the CA2000 diagnostic, which ensures objects are disposed of before losing scope. The severity for this rule is set to "warning" to improve resource management and code quality.

.editorconfig

@@ -242,3 +242,6 @@ dotnet_naming_style.begins_with_i.required_prefix = I
 dotnet_naming_style.begins_with_i.required_suffix = 
 dotnet_naming_style.begins_with_i.word_separator = 
 dotnet_naming_style.begins_with_i.capitalization = pascal_case
+
+# CA2000: Dispose objects before losing scope
+dotnet_diagnostic.CA2000.severity = warning