[spanner] Add TransactionManager - #405

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danielnorberg wants to merge 6 commits into

yoshidan:mainfrom

danielnorberg:dano/transaction-manager

Commits on Nov 20, 2025

[spanner] Add TransactionManager API for manual transaction control with session reuse

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[spanner] Refactor TransactionManager to use client::Error and simplify Drop handling

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[spanner] Eliminate duplicate code in TransactionManager by extracting common logic

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[spanner] Simplify TransactionManager by removing unnecessary helper method

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[spanner] Add transaction() accessor method to TransactionManager

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[spanner] Pass disable_route_to_leader through TransactionManager

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