* fix(deps): update dependency google-gax to v4.3.2

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…nstance creation times (with `FULFILLMENT_PERIOD_NORMAL` or `FULFILLMENT_PERIOD_EXTENDED` ENUM) with the extended instance creation time triggered by On-Demand Capacity Feature (googleapis#2024)

* feat: add several fields to manage state of database encryption update

PiperOrigin-RevId: 619289281

Source-Link: googleapis/googleapis@3a7c334

Source-Link: googleapis/googleapis-gen@6a8c733
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* feat: Add SessionPoolOptions, SpannerOptions protos in executor protos

PiperOrigin-RevId: 621265883

Source-Link: googleapis/googleapis@fed9845

Source-Link: googleapis/googleapis-gen@c66a769
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* feat(spanner): adding `EXPECTED_FULFILLMENT_PERIOD` to the indicate instance creation times (with `FULFILLMENT_PERIOD_NORMAL` or `FULFILLMENT_PERIOD_EXTENDED` ENUM) with the extended instance creation time triggered by On-Demand Capacity Feature

PiperOrigin-RevId: 621488048

Source-Link: googleapis/googleapis@0aa0992

Source-Link: googleapis/googleapis-gen@b8ad4c7
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* feat: add option for optimistic lock in getTransaction method

* feat: add option for optimistic lock in getTransaction method

* add sample for read and write transaction

* add sample for read and write transaction

* chore: add integration test for the read/write query samples

* fix: presubmit error

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* fix: presubmit error

* refactor: sample doc

* refactor: sample doc

* refator: getTransaction method

* fix: lint errors

* fix: lint errors

* refactor: remove logs

* fix: presubmit error

* fix: lint errors

* test: add a unit test for getTransaction

* tests: add integration and unit test for getTransaction options properties

* fix: lint errors

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* refactor: naming convention for varaible in getTransaction method

* refactor: naming convention for varaible in getTransaction method

* fix: lint errors

* fix: lint error

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