Add possibility to initialize enhanced dynamodb WriteBatch with ImmutableTableSchema

### Describe the feature

At the moment it's not possible to use batch operations in enhanced dynamodb client with immutable models.

### Use Case

If I use enhanced dynamodb client with immutable models I shouldn't fall back to low-level dynamodb client for a trivial operations.

### Proposed Solution

Add a new builder method to `software.amazon.awssdk.enhanced.dynamodb.model.WriteBatch` class which accepts `ImmutableTableSchema` instead of item class.

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS Java SDK version used

2.31.65

### JDK version used

java version "24" 2025-03-18

### Operating System and version

Linux 6.14.11