Revert "Merge pull request #1202 from ArminShoeibi/feat/file-scoped-n…

…amespaces"

This reverts commit 1713f50, reversing
changes made to f8c7b9d.

It's a nice feature but it makes it impossible to backport things
from main to 7.x and 6.x unless those branches also adopt it.

So file-scoped namespaces are not necessary worth the backporting pain for library
maintainers.

Conflicts:
	projects/RabbitMQ.Client/client/api/DefaultEndpointResolver.cs
	projects/RabbitMQ.Client/client/impl/AutorecoveringConnection.Recording.cs
	projects/RabbitMQ.Client/client/impl/SocketFrameHandler.cs

projects/RabbitMQ.Client/FrameworkExtension/DictionaryExtension.cs

@@ -1,13 +1,15 @@
 using System.Collections.Generic;
 
-namespace RabbitMQ;
+namespace RabbitMQ
+{
 #nullable enable
 #if NETSTANDARD
-internal static class DictionaryExtension
-{
-    public static bool Remove<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, TKey key, out TValue value)
+    internal static class DictionaryExtension
     {
-        return dictionary.TryGetValue(key, out value) && dictionary.Remove(key);
+        public static bool Remove<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, TKey key, out TValue value)
+        {
+            return dictionary.TryGetValue(key, out value) && dictionary.Remove(key);
+        }
     }
-}
 #endif
+}

projects/RabbitMQ.Client/FrameworkExtension/StringExtension.cs

@@ -1,13 +1,15 @@
 using System;
 
-namespace RabbitMQ;
+namespace RabbitMQ
+{
 #nullable enable
 #if NETSTANDARD
-internal static class StringExtension
-{
-    public static bool Contains(this string toSearch, string value, StringComparison comparisonType)
+    internal static class StringExtension
     {
-        return toSearch.IndexOf(value, comparisonType) > 0;
+        public static bool Contains(this string toSearch, string value, StringComparison comparisonType)
+        {
+            return toSearch.IndexOf(value, comparisonType) > 0;
+        }
     }
-}
 #endif
+}