feat(spanner): Enable multiplex sessions by default for all operations - #12734
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Read-Only, Read-Write and Partition Ops transactions now use a single multiplexed session, instead of a session from the session pool. Multiplexed sessions can handle any number of queries of read-only, read-write and partition ops transactions at the same time.
The use of multiplexed sessions can be disabled for read-only, read-write and partition-ops transactions by setting the environment variables.
See https://cloud.google.com/spanner/docs/sessions#multiplexed_sessions for more background information about multiplexed sessions.