[Path API] join method shouldn't check if the resulting path exists

[Shotman]

Is your feature request related to a problem? Please describe.
Path method join shouldn't check if the resulting path exists since it can be used to generate a valid path to create it later

Describe the solution you'd like
You should be able to call join with parameter that result in paths that don't exist yet

Describe alternatives you've considered
I've just done concatenation for the time being but it's not the best cause Windows and Linux/MacOS don't behave the same so could be better to have it there