aws-servicediscovery: IHttpNamespace doesn't include createService

### Describe the bug

If you try to import any Cloud Map Namespaces using the `fromHttpNamespaceAttributes` method, you cannot call `createService` on the returned object because `IHttpNamespace` doesn't include it.

This is also true of `IPrivateDnsNamespace` and `IPublicDnsNamespace`.

### Expected Behavior

The following example should work:

```typescript
class ImportedNamespaceStack extends Stack {
constructor(scope: Construct, name: string, props: Props) {
const importedNamespace = HttpNamespace.fromHttpNamespaceAttributes(this, 'imported-namespace', {
namespaceName: 'imported',
namespaceId: 'ns-iwasimported',
namespaceArn: 'arn:aws:servicediscovery:us-east-1:123456789012:namespace/ns-iwasimported',
})
importedNamespace.createService('my-cool-service', { name: 'my-cool-service' })
}
}
```

### Current Behavior

It does not compile because `IHttpNamespace` has no method called `createService`.

### Reproduction Steps

See example in expected behavior

### Possible Solution

Expand the interface to include the method:

```typescript
export interface IHttpNamespace extends INamespace {
/**
* Creates a service within the namespace
*/
createService(id: string, props?: BaseServiceProps): Service
}
```

Modify the `fromHttpNamespaceAttributes` to return an object with it implemented:

```typescript
/**
* Creates a HTTP Namespace via all attributes.
*
* Note: While all attributes are required, only namespaceId is used (currently)
* by Service and so the other attributes may be set to placeholder values.
*/
public static fromHttpNamespaceAttributes(scope: Construct, id: string, attrs: HttpNamespaceAttributes): IHttpNamespace {
class Import extends Resource implements IHttpNamespace {
public namespaceName = attrs.namespaceName;
public namespaceId = attrs.namespaceId;
public namespaceArn = attrs.namespaceArn;
public type = NamespaceType.HTTP;

public createService(_id: string, props?: BaseServiceProps): Service {
return new Service(this, _id, {
namespace: this,
...props,
});
}
}
return new Import(scope, id);
}
```

### Additional Information/Context

_No response_

### CDK CLI Version

2.23.0 (build 50444aa)

### Framework Version

_No response_

### Node.js Version

v18.4.0

### OS

All

### Language

Typescript

### Language Version

_No response_

### Other information

_No response_

Start by locating the IHttpNamespace, IPrivateDnsNamespace, and IPublicDnsNamespace interfaces and their from...Attributes import entry points. Compare imported namespace behavior with regular namespace Service creation; done means all three imported namespace types expose createService and the provided TypeScript example compiles.

Written by the indexing model from the issue text.