2.3.0

Various fixes & improvements

• feat: Add Reduce strategy (#157) by @lynnagara
• ref: Remove Position and stop passing timestamps to the commit function (#165) by @lynnagara
• feat: Add a schema validation strategy (#154) by @lynnagara
• fix: Ensure Collect/ParallelCollect properly calls next_step methods (#163) by @lynnagara
• feat: Remove the BatchProcessingStrategy and AbstractBatchWorker (#164) by @lynnagara
• test: Fix streamprocessor tests (#160) by @lynnagara
• docs: Call out the run task strategy (#161) by @lynnagara
• fix: RunTaskWithMultiprocessing handles MessageRejected from subsequent steps (#158) by @lynnagara
• ref: Improve typing of CommitOffsets strategy (#159) by @lynnagara