feat: support crc32c checksum validation #173
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SecretVersions created after July 2021 all have a checksum either
generated by the end user when calling AddSecretVersion or server
side by the Secret Manager API when initially written.
https://cloud.google.com/secret-manager/docs/data-integrity
This change adds an additional crc32c validation to catch possible
data corruption. Note this will not catch corruption that may occur
downstream of the provider (i.e. by the driver process, linux tmpfs
mount, or the process consuming the secret).