(s3tables-alpha): Namespace requires explicit dependency

### Describe the bug

In most constructs, when an input property is reflected back out in the construct's public properties, that public property will be bound to the underlying resource in a manner which implies a dependency on any future usage.

For the Namespace construct, the `namespaceName` is input as a property and re-exposed as a public property on the construct; however, the implementation is simply copying the input property string.

### Regression Issue

- [ ] Select this option if this issue appears to be a regression.

### Last Known Working CDK Library Version

_No response_

### Expected Behavior

When consuming `namespaceName` through the Namespace construct's public property, a token is returned that binds the value in a manner that expresses the implicit dependency.

### Current Behavior

No dependency is expressed, deployment may fail on creation or deletion due to lack of dependency being expressed and resource ordering not correctly being applied.

### Reproduction Steps

```
import { CfnTable } from 'aws-cdk-lib/aws-s3tables';
import { Namespace, TableBucket } from '@aws-cdk/aws-s3tables-alpha';

const app = new App();
const stack = new Stack(app, "Foo");

const tableBucket = new TableBucket(this, 'TableBucket', {
tableBucketName: "foo",
});

const namespace = new Namespace(this, 'Namespace', {
tableBucket,
namespaceName: 'bar',
});

new CfnTable(this, 'Table', {
tableBucketArn: tableBucket.tableBucketArn,
namespace: namespace.namespaceName,
tableName: 'fizz',
openTableFormat: 'ICEBERG',
icebergMetadata: {
icebergSchema: {
schemaFieldList: [
{
name: 'id',
type: 'string',
required: true,
}
]
}
}
});
```

### Possible Solution

Utilize the [Ref value returned by the AWS::S3Tables::Namespace resource](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-resource-s3tables-namespace.html#aws-resource-s3tables-namespace-return-values) via the CfnNamespace L1 construct.

### Additional Information/Context

_No response_

### AWS CDK Library version (aws-cdk-lib)

2.234.1

### AWS CDK CLI version

2.1100.3 (build 0aa3e98)

### Node.js Version

v20.19.2

### OS

MacOS 15.7.3

### Language

TypeScript

### Language Version

TypeScript (5.9.3)

### Other information

Plan to create a PR to fix this shortly. Related to #33054.

Start at the alpha Namespace construct and its CfnNamespace L1 resource, focusing on how the public namespaceName property is produced. Compare it with the AWS::S3Tables::Namespace Ref return value and run the reproduction involving CfnTable; done means consuming namespace.namespaceName expresses the dependency and resource ordering works.

Written by the indexing model from the issue text.