Implement Loop Checking for Jump & Goto operations with minor rule restructure.

Loop checking is done whenever a rule is registered to a chain.
Includes restructuring how rules are added/registered to chains to make loop
checking consistent and restrict adding operations to already registered rules.

Change also performs minor code re-org, moving evaluation methods to the top.

PiperOrigin-RevId: 663039449

pkg/tcpip/nftables/nftinterp.go

@@ -116,7 +116,9 @@ func InterpretRule(ruleString string) (*Rule, error) {
 		if err != nil {
 			return nil, err
 		}
-		r.AddOperation(op)
+		if err := r.AddOperation(op); err != nil {
+			return nil, err
+		}
 	}
 
 	return r, nil