Add a method to disable Operator to change the usage logic of Operator about expr HOT 2 CLOSED

package main

import (
	"fmt"

	"github.com/expr-lang/expr"
)

func main() {
	options := []expr.Option{
		expr.Operator("contains", "Contains"),
		expr.Function(
			"Contains",
			func(params ...any) (any, error) {
				fmt.Println(params)
				return false, nil
			},
			new(func(string, string) bool),
		),
	}

	compile, err := expr.Compile(`"a" contains "b"`, options...)
	if err != nil {
		fmt.Println(err)
		return
	}

	run, err := expr.Run(compile, nil)
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println(run) 
	// Output:
	// [a b]
	// false
}