fix(codegen): create a copy of the context

M V EI2: new software.amazon.smithy.aws.typescript.codegen.visitor.MemberDeserVisitor(ProtocolGenerator$GenerationContext, String, TimestampFormatTrait$Format) may expose internal representation by storing an externally mutable object into MemberDeserVisitor.context  At MemberDeserVisitor.java:[line 66]

Author: trivikr

codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/visitor/MemberDeserVisitor.java

@@ -63,7 +63,7 @@ public MemberDeserVisitor(
         this.dataSource = dataSource;
         this.defaultTimestampFormat = defaultTimestampFormat;
         this.serdeElisionIndex = SerdeElisionIndex.of(context.getModel());
-        this.context = context;
+        this.context = context.copy();
         disableDeserializationFunctionElision = DeserializerElisionDenyList.SDK_IDS.contains(
             context.getService().getTrait(ServiceTrait.class)
                 .map(ServiceTrait::getSdkId)