Add SCIM module implementing SCIM 2.0 protocol

By adding a nuxeo-scim-v2 module, base on the existing nuxeo-scim-server module, initially integrated to the Platform from https://github.com/tiry/nuxeo-scim-server/ with NXP-15700.

Scope:

• CRUD for Users and Groups endpoints
• Discovery endpoint

Basically:

• Add the nuxeo-scim-v2 module copied from nuxeo-scim-server.
• Upgrade the SCIM SDK from com.unboundid.product.scim:scim-sdk to com.unboundid.product.scim2:scim2-sdk-client.
• Implement SCIM service provider, inspired by scim2-sdk-server.
• Implement SCIM compliance tests, inspired by the scim2-sdk-server tests, using the scim2-sdk-client.