feat(datastore) adds more serialization/deserialization tests

[giogam]

This adds tests to confirm that ordering is maintained across the JSON marshal/unmarshal of address_refs and contract_metadata. This will be expanded to also cover custom metadata fields

[changeset-bot]

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Latest commit: beb74f2

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[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
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0.0% Duplication on New Code

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[graham-chainlink]

looks good since datastore uses slice, so order is honoured

[graham-chainlink]

Actually, i prefer the comparison to be done with JSON string, this is more fool proof as that is essentially what we see in CLD

[graham-chainlink]

Imagine some one implement MarshalJSON and ruin the ordering, this tests still pass but we dont get what we want anymore.