[K8SPXC-200] Add support for custom options for xtrabackup, xbstream, xbcloud

[spron-in]

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Tell us about the feature In our backups and restoration process we rely on XtraBackup, xbstream and xbcloud.

Not always default options for these tools are optimal. Sometimes users want to tune them. Examples:

[https://github.com/presslabs/mysql-operator/issues/437]

[https://forums.percona.com/t/backups-failing-if-s3-bucket-configured-with-objectlock-enabled/10806/4]

 

This improvement adds the ability to specify custom flags through CR.

Also it may cover https://jira.percona.com/browse/K8SPXC-758