Feat: Support subwallet upgradation using the Upgrade command

[shaangill025]

• resolve Support updating sub-wallets [Multitenant env] with Upgrade command #2507

[dbluhm]

It's not something that was introduced by this PR but I think it's worth calling out nonetheless:

First, I think the whole upgrade method is due for a refactor. It's a beast of a method. When we recently worked through the upgrade process, working out how to potentially do an upgrade for a change we were working on, it took quite some time to parse through the code.

Second, consider this line:

https://github.com/hyperledger/aries-cloudagent-python/blob/9b16660508c3b1e9c70af46e38afbe51f8fcc6d1/aries_cloudagent/commands/upgrade.py#L395

This line is retrieving ALL records of the given type at once. This can result in out-of-memory issues if there are enough records in the wallet of that record type. We should probably be using a BaseStorageSearch to perform this record retrieval so that it can be done in batches: https://github.com/hyperledger/aries-cloudagent-python/blob/9b16660508c3b1e9c70af46e38afbe51f8fcc6d1/aries_cloudagent/storage/askar.py#L203-L235

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[shaangill025]

@dbluhm Re the need to refactor, I mentioned it to @swcurran and I think this can be taken up in the future (separate from this PR). Re using BaseStorageSearch -> search_records, I have replaced query in upgrade.py with it.