Automatically decode XDR structures in simulation responses

[Shaptic]

The RPC response schemas for simulation have been upgraded to parse the base64-encoded XDR automatically. Succinctly,

• SimulateTransactionResponse -> RawSimulateTransactionResponse
• SimulateHostFunctionResult -> RawSimulateHostFunctionResult
• Now, SimulateTransactionResponse and SimulateHostFunctionResult now include the full, decoded XDR structures instead of raw, base64-encoded strings for the relevant fields

Here is the full list of changed fields:

  export interface SimulateHostFunctionResult {
-    auth?: string[];
-    xdr: string;
+    auth: xdr.SorobanAuthorizationEntry[];
+    xdr: xdr.ScVal;
  }

  export interface SimulateTransactionResponse {
-    transactionData: string;
+    transactionData: SorobanDataBuilder;
-    events: string[];
+    events: xdr.DiagnosticEvent[];
-    results: SimulateHostFunctionResult[];
+    result?: SimulateHostFunctionResult;
  }

The true, raw, underlying schema is still accessible by adding the Raw prefix to the interface name.