[TM-234] Use `UStore` in DSProtocol
Description
Problem: we are going to make DSProtocol upgradeable. In particular, this requires dedicated version of big_maps incapsulating storage.
Solution: update UStore in indigo for that.
Required for DS Token implementation.
Related issue(s)
https://issues.serokell.io/issue/TM-234
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Edited by Ivan Gromakovskii