OIDC groups-field doesn't support namespaced URI claim name

[nbmarques]

If I configure the groups-field with a custom claim with a namespaced URI format, no groups are found.

akhq:
  security:
    oidc:
      enabled: true
      providers:
        custom-provider:
          label: "Login with OIDC"
          groups-field: https://custom.namespace.com/claims/roles

This happens because org.akhq.security.mapper.OidcUserDetailsMapper#getClaimValue is spiting the claim name by ".":

akhq/src/main/java/org/akhq/security/mapper/OidcUserDetailsMapper.java

Lines 146 to 158 in 45a5fc3

	private Object getClaimValue(OpenIdClaims openIdClaims, String name) {
	final String[] subFields = name.split("\\.");
	Object claimValue = openIdClaims.get(subFields[0]);
	for(int i = 1; i < subFields.length; i++) {
	final String subField = subFields[i];
	if (claimValue instanceof Map) {
	claimValue = ((Map) claimValue).get(subField);
	} else {
	break;
	}
	}
	return claimValue;
	}

Can this be changed to first check if the claim exists?

    private Object getClaimValue(OpenIdClaims openIdClaims, String name) {
        if (openIdClaims.contains(name)) {
            return openIdClaims.get(name);
        }
        final String[] subFields = name.split("\\.");
        Object claimValue = openIdClaims.get(subFields[0]);
        for(int i = 1; i < subFields.length; i++) {
            final String subField = subFields[i];
            if (claimValue instanceof Map) {
                claimValue = ((Map) claimValue).get(subField);
            } else {
                break;
            }
        }
        return claimValue;
    }