Liens can only be taken on vested tokens

[JimLarson]

What is the Problem Being Solved?

We want to disallow the use of unvested tokens for obtaining a lien, since a clawback would remove the collateral and eliminate the incentive to repay the loan.

Description of the Design

• Add a field for unvested tokens to the GET_ACCOUNT_STATE bridge query (Cosmos)
• Use it when advertising how git a lien you can take (JS)
• Check vested token supply when increasing a lien in x/lien (Cosmos).

Security Considerations

None

Test Plan

Unit tests on each side.