Support for custom body parsers

[Badgerati]

Describe the Feature

Currently when a body/payload is supplied to Pode, the inbuilt parsers are XML, CSV, JSON, Form, and MultiForm.

It would be nice to support custom parsers - to not only add parsers for new content type, but also override the inbuilt ones.

Add-PodeBodyParser -ContentType 'text/yaml' -ScriptBlock {
    param($body)

    # some logic to parse it

    return $parsed_body
}

plus a:

Remove-PodeBodyParser -ContentType 'text/yaml'

So just before the ConvertFrom-PodeRequestContent internal function is about to parse, it checks some map of custom parsers for the content type first.

Additional Context

This could to open the way for Pode extensions - like a Pode-Yaml parser, etc.