cleans spaces when constructing an expression name (#3844)

Author: cenedhryn

services-custom/dynamodb-enhanced/src/main/java/software/amazon/awssdk/enhanced/dynamodb/internal/EnhancedClientUtils.java

@@ -37,7 +37,7 @@
 @SdkInternalApi
 public final class EnhancedClientUtils {
     private static final Set<Character> SPECIAL_CHARACTERS = Stream.of(
-        '*', '.', '-', '#', '+', ':', '/', '(', ')',
+        '*', '.', '-', '#', '+', ':', '/', '(', ')', ' ',
         '&', '<', '>', '?', '=', '!', '@', '%', '$', '|').collect(Collectors.toSet());
 
     private EnhancedClientUtils() {

services-custom/dynamodb-enhanced/src/test/java/software/amazon/awssdk/enhanced/dynamodb/functionaltests/BasicCrudTest.java

@@ -45,7 +45,7 @@
 import software.amazon.awssdk.services.dynamodb.model.ProjectionType;
 
 public class BasicCrudTest extends LocalDynamoDbSyncTestBase {
-    private static final String ATTRIBUTE_NAME_WITH_SPECIAL_CHARACTERS = "a*t:t.r-i#bute+3/4(&?5=@)<6>!ch$ar%";
+    private static final String ATTRIBUTE_NAME_WITH_SPECIAL_CHARACTERS = "a*t:t.r-i#bute +3/4(&?5=@)<6>!ch$ar%";
 
     private static class Record {
         private String id;