bedrock: L2 Constructs

### Describe the feature

I would like to use L2 constructs to provision Bedrock related resources with sensible defaults. Now that L1 constructs have been added via https://github.com/aws/aws-cdk/pull/29911 , this should be possible now!

### Use Case

I have been using the awslabs/generative-ai-cdk-constructs library to provision and configure Bedrock related resources, but this library makes use of custom resources to perform all of its actions. I much rather use native constructs rather than custom resources.

https://github.com/awslabs/generative-ai-cdk-constructs

### Proposed Solution

If possible, use the same defaults that the generative-ai-cdk-constructs library is using for each of its L2-like constructs. In my opinion, this would make it a little bit easier to users to migrate without having to change too much. If not, that's fine too.

### Other Information

_No response_

### Acknowledgements

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

### CDK version used

2.139.0

### Environment details (OS name and version, etc.)

macOS 14.4.1

Start by reviewing the Bedrock L1 constructs introduced in PR #29911 and comparing the awslabs/generative-ai-cdk-constructs library's L2-like constructs and defaults. Done means defining a decided scope for native L2 Bedrock constructs with sensible defaults and a migration path that avoids custom resources.

Written by the indexing model from the issue text.