Add changedSinceSlot arg for gPA

Author: cloakd

rpc/getProgramAccounts.go

@@ -59,6 +59,9 @@ func (cl *Client) GetProgramAccountsWithOpts(
 				"length": opts.DataSlice.Length,
 			}
 		}
+		if opts.ChangedSinceSlot != nil {
+			obj["changedSinceSlot"] = *opts.ChangedSinceSlot
+		}
 	}
 
 	params := []any{publicKey, obj}

rpc/types.go

@@ -406,6 +406,9 @@ type GetProgramAccountsOpts struct {
 	// Filter results using various filter objects;
 	// account must meet all filter criteria to be included in results.
 	Filters []RPCFilter `json:"filters,omitempty"`
+
+	// Return only the accounts that have changed since this slot
+	ChangedSinceSlot *uint64 `json:"changedSinceSlot,omitempty"`
 }
 
 type GetProgramAccountsResult []*KeyedAccount