Use mapping from external AstarBase #39
Merged
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Since there are many already registered users in the initial AstarBase on Shiden, this PR will use this old contract as an external database.
If an entry is not found in the local contract, we will query the external (old) contract.
If the entry is found in the external contract, it will be registered locally. This is to same some gas and speed up tx next time the same entry is queried.