Support for Bun javascript runtime

#### Support plan

* *is this issue currently blocking your project?* (yes/no): yes
* *is this issue affecting a production system?* (yes/no): no

#### Context

* *node version*: I use Bun 0.5.6
* *module version*:
* *environment* (e.g. node, browser, native): bun
* *used with* (e.g. hapi application, another framework, standalone, ...): standalone
* *any other relevant information*:

#### What problem are you trying to solve?

As early as I can remember, I've always used Joi as my go-to library from input/args validations.
I would be happy if Joi could work with Bun.

Right now any form of validation fails in Bun 0.5.6, and the error message is inconsistant.

#### Do you have a new or modified API suggestion to solve the problem?

Fallback to a polyfill for the methods not available in Bun ?

Start by reproducing the validation failure with Bun 0.5.6 and inspect the repository's runtime compatibility assumptions. Identify the unsupported methods and define tests that demonstrate successful validation under Bun; done means Joi validation works consistently in the reported environment.

Written by the indexing model from the issue text.