[fs-monkey] Doesn't patch `readFile` promise

[regseb]

With this code:

import fs, { readFile, readFileSync } from "node:fs";
import fsPromises, { readFile as readFilePromise } from "node:fs/promises";
import { vol } from "memfs";
import { patchFs } from "fs-monkey";

vol.fromJSON({ "foo": "bar" });
patchFs(vol);

const test = (fn) => {
    fn((err, data) => {
        if (err) {
            console.log(fn.toString().slice(8), "ERR");
        } else {
            console.log(fn.toString().slice(8), "OK");
        }
    });
};

const testSync = (fn) => {
    try {
        const data = fn();
        console.log(fn.toString().slice(6), "OK");
    } catch (err) {
        console.log(fn.toString().slice(6), "ERR");
    }
};

const testAsync = async (fn) => {
    try {
        const data = await fn();
        console.log(fn.toString().slice(6), "OK");
    } catch (err) {
        console.log(fn.toString().slice(6), "ERR");
    }
};

test((cb) => fs.readFile("foo", "utf8", cb));
test((cb) => fs.readFile("foo", cb));
test((cb) => readFile("foo", "utf8", cb));
test((cb) => readFile("foo", cb));
testSync(() => fs.readFileSync("foo", "utf8"));
testSync(() => fs.readFileSync("foo"));
testSync(() => readFileSync("foo", "utf8"));
testSync(() => readFileSync("foo"));
await testAsync(() => fs.promises.readFile("foo", "utf8"));
await testAsync(() => fs.promises.readFile("foo"));
await testAsync(() => fsPromises.readFile("foo", "utf8"));
await testAsync(() => fsPromises.readFile("foo"));
await testAsync(() => readFilePromise("foo", "utf8"));
await testAsync(() => readFilePromise("foo"));

Only fs.readFile() and fs.readFileSync() work.

Function	Result
fs.readFile("foo", "utf8", cb)	✅
fs.readFile("foo", cb)	✅
readFile("foo", "utf8", cb)	❌
readFile("foo", cb)	❌
fs.readFileSync("foo", "utf8")	✅
fs.readFileSync("foo")	✅
readFileSync("foo", "utf8")	❌
readFileSync("foo")	❌
fs.promises.readFile("foo", "utf8")	❌
fs.promises.readFile("foo")	❌
fsPromises.readFile("foo", "utf8")	❌
fsPromises.readFile("foo")	❌
readFilePromise("foo", "utf8")	❌
readFilePromise("foo")	❌

I tested with and without "utf8" because the behavior can be different: nodejs/node#48658