chore: remove session pool and only use multiplexed sessions #4191
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Removes the
SessionPooland related classes and deprecates theSessionPoolOptionsclass. This simplifies large parts of the code, as the only possible code path is the use of multiplexed sessions.After this change, the client does not create and initialize a session pool when it is created. This means that the number of sessions that is observed on Spanner will be much lower, as each
DatabaseClientonly creates 1 multiplexed session.