[Improvement] reduce the redundant appId info for partitionKey in AbstractStorage

[lwllvyb]

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What would you like to be improved?

There are three private variables in AbstractStorage that use partitionKey as the key for the internal Map.
PartitionKey uses the redundant appId info which is already the first key of the three private variables .

How should we improve?

No response

Are you willing to submit PR?

• [X] Yes I am willing to submit a PR!