Add ability to specify route namespace

[dominic-ks]

Originally request here:

• https://wordpress.org/support/topic/add-ability-to-specify-route-namespace/

Add new filters to allow developers to customise the name space for the API calls. The filter will need to be added to 3 files and could be added directly inline in the register_rest_route parameter.

• /inc/api/api.route.reset-password.php
• /inc/api/api.route.set-password.php
• /inc/api/api.route.validate-code.php

The filter name should follow the general naming convention that's been used for the other hooks in this plugin.

[wpamitkumar]

Hi @dominic-ks, Please review the PR. [#5 ]

[dominic-ks]

All done, thanks very much.