(lambda): partial batch response and filtering support for lambda event sources

### Describe the feature

This is a new feature launched last year - has yet to be implemented in CloudFormation however.

### Use Case

To give customers access to new feature

### Proposed Solution

_No response_

### Other Information

Originally reported in P66389528 - CloudFormation support is being worked on internally

### Acknowledgements

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

### CDK version used

.

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

.

The issue names Lambda event sources and CloudFormation but gives no file, test, or implementation details. Start by locating the CDK Lambda event-source resource and its CloudFormation properties, then check how partial batch responses and filtering are represented. Done means the requested feature is exposed through CDK and covered by relevant tests.

Written by the indexing model from the issue text.