Update engine, handbook, and pipeline files with feature enhancements

[tomadowley]

This pull request implements feature-specific changes across multiple files to enhance functionality and documentation.

Changes in engine.py:

• Updated the greeting message and signoff format in the greet function.
• Introduced a new multiply function to perform multiplication.
• Adjusted the log level to WARN and modified the logger format to include the logger name.
• Updated the versioning function to append '-feature' to the version string.
• Changed feature flags accordingly.

Changes in handbook.md:

• Made updates to coding standards and release process chapters for clarity and added documentation about PR requirements.
• Revised the incident response procedures for timeliness in RCA and postmortem documentation.

Changes in pipeline.sql:

• Enhanced SQL queries to include additional conditions and formatting in temporary tables.
• Updated the revenue summation process for better accuracy and added HAVING clause.
• Adjusted the output data structure to include yyyymm instead of date (dt) in output tables, and modified finalization command for better performance.

These changes together facilitate smoother feature development and improve existing functions, adhering to updated standards.

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This pull request was co-created with Cosine Genie

Original Task: conflicts_test_github/09ih52a2yii8
Author: Tom Dowley