[spark] Fix SparkCatalog converts catalog option keys to lower case (#6708)

Author: zhan7236

paimon-spark/paimon-spark-common/src/main/java/org/apache/paimon/spark/SparkCatalog.java

@@ -128,7 +128,8 @@ public void initialize(String name, CaseInsensitiveStringMap options) {
         this.catalogName = name;
         CatalogContext catalogContext =
                 CatalogContext.create(
-                        Options.fromMap(options), sparkSession.sessionState().newHadoopConf());
+                        Options.fromMap(options.asCaseSensitiveMap()),
+                        sparkSession.sessionState().newHadoopConf());
         this.catalog = CatalogFactory.createCatalog(catalogContext);
         this.defaultDatabase =
                 options.getOrDefault(DEFAULT_DATABASE.key(), DEFAULT_DATABASE.defaultValue());