Allow asset participation in governance to be configurable

[javiersuweijie]

Not all assets should be allowed to participate in governance as there might be conflict of interests in some cases.

• [ ] Wrap the governance module (x/gov) Tally method with a modified implementation that checks if assets should be part of the voting power calculation.
• [ ] Update SDK initialization to wire the modified x/gov module
• [ ] Update docs on how to integrate