feat: query connections by theirLabel and alias

[genaris]

This was mainly created to fix openwallet-foundation/credo-ts-ext#267, as it might be useful to query connections by these parameters.

The bad thing about it is that previously created connections won't work with these query parameters, unless we do a migration script (which of course should be reserved to a major version).

[GHkrishna]

Any specific reason why we have not merged this?

Will this be blocked until the next major release

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[TimoGlastra]

The reason we didn't merge it, as adding it doesn't solve it for already stored records. We can probably merge it now, and do the migration later on? However, it won't be clear from the API that these values are only queryable for new records. So maybe wait until 0.6?

[GHkrishna]

Okay, that seems a bit far but makes sense to add it in 0.6 :)