Add SCIM user provisionning

Currently we can authenticate with modern platform using oauth plugin (should be native in core for me...) for example with Azure

but when users can open tickets without connecting to GLPI (by phone or email for example), you have to automatically import your users in GLPI. Currently you have to use LDAP, and it's not consistent with using modern auth system

so it will be perfect to be able to use SCIM (for example with Azure AD) to create users in GLPI, whether they connect to GLPI or not