Fix: Zod instanceof not working in lib

[cau777]

Task: https://www.notion.so/Fix-instanceof-on-zod-9c21631b782043fdb67a42e8263a40dc?pvs=4

This is the added code to ZodType (there is no syntax highlighting on the GitHub diff):

// The instanceof operator does not work properly when ts-mongo is imported from another library
// https://stackoverflow.com/questions/59265098/instanceof-not-work-correctly-in-typescript-library-project
// This alternative implementation checks the constructor names of the object and its inherited classes
static [Symbol.hasInstance](instance) {
    if (
        typeof instance !== 'object' ||
        instance === null ||
        !('_def' in instance)
    )
        return false

    // Also check inherited prototypes
    const getPrototypeChain = (prototype) => {
        if (!prototype) return []
        return [prototype, ...getPrototypeChain(prototype.__proto__)]
    }

    const prototypes = getPrototypeChain(instance)
    const className = this.name
    return prototypes.some((proto) => proto.constructor.name === className)
}

The idea is to overwrite the instanceof operator on ZodType (all zod classes inherit it) code to check class names instead of constructor references (which are different when ts-mongo is used as a library).
We could submit this fix to zod but it seems PRs there take a while to reach production.
This PR was tested locally by importing it from the app using a dependency link.

[tianhuil]

LGTM! Great tests @cau777 !