Feature Request: Option to obtain UUID as non-formatted string

[piroot01]

Currently, the UUID toString() method returns a string representation of the UUID consisting of groups of hexadecimal digits separated by hyphens. While this is the standard format, there might be use-cases where developers would find it useful to have the UUID as a non-formatted string (without the hyphens).

I propose adding an optional argument to the toString() method that allows developers to specify whether they want the UUID returned as a formatted or non-formatted string.

This would provide more flexibility for developers using the Poco library.