Support Partial Imports into Keycloak

[joao-rebelo]

Problem Statement

In our current workflow we provide an initial configuration state, and along the time we need to release "patches" that change only some aspects of the configuration. Since keycloak configuration might have been locally changed by some other form we would like to only affect exactly what we provide as patch.

Proposed Solution

As a simple example importing a file as

{
"id": "xpto",
"ssoSessionMaxLifespan": 3600
}

would change the Session Max Lifespan of the realm and leave everything else untouched

Environment

No response

Additional information

At the recent KeyConf it was mentioned that partial imports were already supported, but I don't see it documented and also didn't saw such an option while seeing the ImportConfigProperties class.
if there is some other way to achieve this, then this ticket can be considered duplicated.

Acceptance Criteria

No response