What does this PR do?

Adds batch processor before lsm interval processor. This reduces the merge operation that lsm interval processor needs to perform and improves performance.

Why is it important?

To improve performance of lsm interval processor. For more details checkout elastic/opentelemetry-collector-components#211

Checklist

• I have read and understood the pull request guidelines of this project.
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in ./changelog/fragments using the changelog tool
• I have added an integration test or an E2E test

Disruptive User Impact

How to test this PR locally

Related issues

• Relates [processor/lsminterval] Optimize memory usage for each aggregation interval opentelemetry-collector-components#211

Questions to ask yourself

• How are we going to support this in production?
• How are we going to measure its adoption?
• How are we going to debug this?
• What are the metrics I should take care of?
• ...