Refine IApplication interface

[cygnusv]

The dashboard defines the following interface for Threshold application contracts:

token-dashboard/src/threshold-ts/applications/index.ts

Line 82 in bc59c7c

export interface IApplication {

Although most of the endpoints here are defined by the canonical IApplication interface in the contracts' repo, it seems that there are some additional methods that seems tBTC/RB specific. The only common denominator we should assume is the contracts' IApplication interface, and the dashboard seems to assume extra stuff that clashes with the TACo app contract.

See a tangentially related issue, maybe a bit old but still relevant: threshold-network/solidity-contracts#88