Feature Request: add Fluentbit Splunk Example

It would be nice to have a fluentbit Splunk example.

Start by reviewing the repository’s existing FireLens examples and identifying how a Fluent Bit integration with Splunk would fit the AWS ECS and Fargate sample architectures. The issue does not name a file, configuration, or acceptance criteria, so confirm the expected example scope with maintainers before starting. Done means the requested Splunk example is added consistently with the existing examples.

Written by the indexing model from the issue text.