Add applyMappings sync action

[karelmaxa]

This PR adds a new applyMappings action to the synchronization service that evaluates
property mappings and transformation scripts against a caller-supplied source object and returns
the resulting target object.

Usage

curl \
  --request POST \
  --header "Content-Type: application/json" \
  --header "X-OpenIDM-Username: openidm-admin" \
  --header "X-OpenIDM-Password: openidm-admin" \
  --data '{
    "source": {
      "userName": "jdoe",
      "givenName": "John",
      "sn": "Doe",
      "mail": "jdoe@example.com"
    }
  }' \
  "http://localhost:8080/openidm/sync?_action=applyMappings&mapping=managedUser_ldapAccount"

Example response

{
  "dn": "uid=jdoe,ou=people,dc=example,dc=com",
  "uid": "jdoe",
  "cn": "John Doe",
  "sn": "Doe",
  "mail": "jdoe@example.com"
}

Request parameters:

Parameter	Location	Required	Description
mapping	query	yes	Name of the mapping to evaluate
linkQualifier	query	no	Link qualifier (defaults to default)
source	body	yes	Source object to map
oldSource	body	no	Previous source state, exposed to transform scripts
target	body	no	Starting target state (defaults to empty)
existingTarget	body	no	Existing target for reference in default mapping / role scripts

[sonarqubecloud]

Quality Gate failed

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9.1% Coverage on New Code (required ≥ 80%)
C Maintainability Rating on New Code (required ≥ A)

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