Feature/fee grant (#1419)

* Temporarily point cosmrs to PR branch

* Expose grant allowance in client

* Move functions in coconut verifier

* Do execute from gateway

* Explicit fee payment by granter

* Include revoke grant after finishing with the op

* Gateway checks the proposal content before proceeding

* Clippy fixes

* CHANGELOG update

validator-api/validator-api-requests/src/coconut.rs

@@ -15,13 +15,20 @@ pub struct VerifyCredentialBody {
     credential: Credential,
     #[getset(get = "pub")]
     proposal_id: u64,
+    #[getset(get = "pub")]
+    gateway_cosmos_addr: AccountId,
 }
 
 impl VerifyCredentialBody {
-    pub fn new(credential: Credential, proposal_id: u64) -> VerifyCredentialBody {
+    pub fn new(
+        credential: Credential,
+        proposal_id: u64,
+        gateway_cosmos_addr: AccountId,
+    ) -> VerifyCredentialBody {
         VerifyCredentialBody {
             credential,
             proposal_id,
+            gateway_cosmos_addr,
         }
     }
 }
@@ -154,11 +161,16 @@ impl CosmosAddressResponse {
 pub struct ProposeReleaseFundsRequestBody {
     #[getset(get = "pub")]
     credential: Credential,
+    #[getset(get = "pub")]
+    gateway_cosmos_addr: AccountId,
 }
 
 impl ProposeReleaseFundsRequestBody {
-    pub fn new(credential: Credential) -> Self {
-        ProposeReleaseFundsRequestBody { credential }
+    pub fn new(credential: Credential, gateway_cosmos_addr: AccountId) -> Self {
+        ProposeReleaseFundsRequestBody {
+            credential,
+            gateway_cosmos_addr,
+        }
     }
 }
 
@@ -172,15 +184,3 @@ impl ProposeReleaseFundsResponse {
         ProposeReleaseFundsResponse { proposal_id }
     }
 }
-
-#[derive(Debug, Serialize, Deserialize, Getters, CopyGetters)]
-pub struct ExecuteReleaseFundsRequestBody {
-    #[getset(get = "pub")]
-    proposal_id: u64,
-}
-
-impl ExecuteReleaseFundsRequestBody {
-    pub fn new(proposal_id: u64) -> Self {
-        ExecuteReleaseFundsRequestBody { proposal_id }
-    }
-}