### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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/test/java/org/elasticsearch/xpack/security/authc/ApiKeyServiceTests.java
RoleDescriptorTests.randomClusterPrivileges(),
            generateRandomStringArray(5, randomIntBetween(2, 8), false, true),
            RoleDescriptorTests.randomRoleDescriptorMetadata(randomBoolean()),
            Map.of(),
            null,
            RoleRestrictionTests.randomWorkflowsRestriction(1, 3)
        );
    }
    public static class Utils {
        private static final AuthenticationContextSerializer authenticationContextSerializer = new AuthenticationContextSerializer();
        public static Authentication createApiKeyAuthentication(
            ApiKeyService apiKeyService,
            Authentication authentication,
            Set<RoleDescriptor> userRoles,
            List<RoleDescriptor> keyRoles,
            TransportVersion version
        ) throws Exception {
            XContentBuilder keyDocSource = ApiKeyService.newDocument(
                getFastStoredHashAlgoForTests().hash(new SecureString(randomAlphaOfLength(16).toCharArray())),
                "test",
                authentication,
                userRoles,
                Instant.now(),
                Instant.now().plus(Duration.ofSeconds(3600)),
                keyRoles,
                ApiKey.Type.REST,
                Version.CURRENT,
                randomBoolean() ? null : Map.of(randomAlphaOfLengthBetween(3, 8), randomAlphaOfLengthBetween(3, 8))
            );
            final ApiKeyDoc apiKeyDoc = ApiKeyDoc.fromXContent(