[HUDI-7668] Add and rename APIs in StorageConfiguration

[yihua]

Change Logs

This PR makes the following changes:

• Adds StorageConfiguration#newInstance to create a new StorageConfiguration instance with a new copy of the configuration.
• Adds StorageConfiguration#setIfUnset to set a property key with a value in the configuration, if the property key does not already exist.
• Renames StorageConfiguration#get to StorageConfiguration#unwrap for readability.
• Renames StorageConfiguration#newCopy to StorageConfiguration#unwrapCopy for readability.

Impact

New APIs to facilitate integration of StorageConfiguration.

Risk level

none

Documentation Update

none

Contributor's checklist

• Read through contributor's guide
• Change Logs and Impact were stated clearly
• Adequate tests were added if applicable
• CI passed

[jonvex]

I feel like "newCopy()" should return a copy of the storageconfiguration not a copy of the underlying configuration.

maybe "getCopy()" would make more sense, because then it would match the wording with "get()"

[yihua]

I feel like "newCopy()" should return a copy of the storageconfiguration not a copy of the underlying configuration.

maybe "getCopy()" would make more sense, because then it would match the wording with "get()"

As discussed offline, rename #getCopy to #unwrapCopy for better readability.

[hudi-bot]

CI report:

• 0689b43 Azure: SUCCESS

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