Common adapter response type for SAC

CommonAdapterResponse.ts

export interface AdapterResponse {
    // User's address
    address: string;         
    
    // Number of tokens, should already be scaled for UI display
    tokens: number;         
    
    // Whether the user is eligible (we can calculate based on tokens if not available)
    isEligible: boolean;    
    
    // If there was an error (rate limit, etc), this should be populated
    error: string | null;   
}