### Description

The [Get API key information API](https://www.elastic.co/guide/en/elasticsearch/reference/master/security-api-get-api-key.html) can currently filter the returned keys by:
 * key id/name
 * keys owned by the calling user
 * keys owned by other users, by `realm_name` and `username`

Irrespective of the filtering used, both invalidated and expired (but not yet deleted) keys will be included in the response.
In the response, keys have the `invalidated` boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.

I propose we introduce a way for the API to support retrieving:
* only valid API keys (not return invalidated keys) - using a boolean request parameter
* keys not expired before a certain timestamp - using a timestamp parameter that defaults to "now" - also note that keys' experiation date is always checked against the local node's clock
x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc/ApiKeyService.java
private static final Logger logger = LogManager.getLogger(ApiKeyService.class);
    private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(ApiKeyService.class);
    public static final Setting<String> PASSWORD_HASHING_ALGORITHM = XPackSettings.defaultStoredHashAlgorithmSetting(
        "xpack.security.authc.api_key.hashing.algorithm",
        (s) -> Hasher.PBKDF2.name()
    );
    public static final Setting<TimeValue> DELETE_TIMEOUT = Setting.timeSetting(
        "xpack.security.authc.api_key.delete.timeout",
        TimeValue.MINUS_ONE,
        Property.NodeScope
    );
    public static final Setting<TimeValue> DELETE_INTERVAL = Setting.timeSetting(
        "xpack.security.authc.api_key.delete.interval",
        TimeValue.timeValueHours(24L),
        Property.NodeScope
    );
    public static final Setting<TimeValue> DELETE_RETENTION_PERIOD = Setting.positiveTimeSetting(
        "xpack.security.authc.api_key.delete.retention_period",
        TimeValue.timeValueDays(7),
        Property.NodeScope,