Allow scope addresses for attributes

[iramiller]

Summary

As part of the upcoming asset classification system scopes will need to be able to have attributes assigned to them. In order for this to work the allowed bech32 address prefixes will need to be extended to allow scope in addition to tp and pb used for normal accounts.

Problem Definition

The asset classification program uses controlled names owned by the Provenance foundation and delegated representatives to create classifications. sample.provenance.asset could be assigned to a some specific scope or account with an appropriate value. In order for this to work on metadata scopes the validation logic of the attribute module must be extended to allow this alternate address prefix. The rest of the scope MetadataAddress is already compliant with the required AccAddress expected format.

Proposal

Update the attribute module to allow the scope prefixed addresses to be used for attribute assignment.

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