parser: table option should always restore without quotes

[h3n4l]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

package test
import (
	_ "github.com/pingcap/tidb/types/parser_driver"
	"github.com/stretchr/testify/require"
	"github.com/pingcap/tidb/parser"
	"github.com/pingcap/tidb/parser/ast"
	"github.com/pingcap/tidb/parser/format"
	"github.com/pingcap/tidb/parser/model"
)
func TestTableOption(t *testing.T) {
	tests := []struct {
		new  string
		want string
	}{
		{
			new:  `CREATE TABLE book(id INT) INSERT_METHOD = FIRST;`,
			want: "ALTER TABLE `book` INSERT_METHOD = FIRST;\n",
		},
	}
	a := require.New(t)
	
	for _, test := range tests {
		nodes := parser.New().Parse(test.new, "", "")
		get := deparse(diff, format.DefaultRestoreFlags|format.RestoreStringWithoutCharset)
		a.Equal(test.want, get)
	}
}

func deparse(nodes []ast.Node, flag format.RestoreFlags) (string, error) {
	var buf bytes.Buffer
	for _, node := range nodes {
		if err := node.Restore(format.NewRestoreCtx(flag, &buf)); err != nil {
			return "", err
		}
		if _, err := buf.Write([]byte(";\n")); err != nil {
			return "", err
		}
	}
	return buf.String(), nil
}

We can find that the get is:

ALTER TABLE `book` INSERT_METHOD = 'FIRST';\n

It's caused by ctx.WriteString(n.StrValue) in here. We will encounter the error if we execute it in MySQL client:

2. What did you expect to see? (Required)

Restore should restore INSERT_METHOD without quotes likes:

CREATE TABLE `tbl`(id INT) INSERT_METHOD = FIRST.

https://dev.mysql.com/doc/refman/8.0/en/create-table.html

3. What did you see instead (Required)

CREATE TABLE `tbl`(id INT) INSERT_METHOD = 'FIRST'.

4. What is your TiDB version? (Required)

Parser at HEAD.

[h3n4l]

I fix it in #38355