More investigation on TransactionSerializationError

[msullivan]

• Configs that could reduce them? Postgres says "It may be helpful to encourage the use of index scans by reducing random_page_cost and/or increasing cpu_tuple_cost."
• Codegen changes. Do we have any remaining codegen problems that unnecessarily trigger these?
• Tooling - what can we do to expose more information to users to debug these?

[msullivan]

@elprans did you have some idea about what data to check for debugging questions?