fix: add expiration time for cached reader connections

[karenc-bq]

Summary

If connection pool isn't used, the read/write splitting plugin caches the reader connection forever, all read operations will be redirected to a single instance when setReadOnly(true) is called. This may impede performance.
This PR provides a connection parameter allowing user applications to redirect read operations to other instances after certain expiration time.

Description

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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