### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
"restriction":{"workflows":["search_application"]}
                    },
                    "role_without_restriction":{
                        "indices":[{"names":["movies"],"privileges":["read"]}]
                    }
                }
            """);
        roleDescriptors = service.parseRoleDescriptorsBytes(apiKeyId, roleBytes, apiKeyRoleType);
        assertEquals(2, roleDescriptors.size());
        Map<String, RoleDescriptor> roleDescriptorsByName = roleDescriptors.stream()
            .collect(Collectors.toMap(RoleDescriptor::getName, Function.identity()));
        assertEquals(Set.of("role_with_restriction", "role_without_restriction"), roleDescriptorsByName.keySet());
        RoleDescriptor roleWithRestriction = roleDescriptorsByName.get("role_with_restriction");
        assertThat(roleWithRestriction.hasRestriction(), equalTo(true));
        assertThat(roleWithRestriction.getRestriction().isEmpty(), equalTo(false));
        assertThat(roleWithRestriction.getRestriction().hasWorkflows(), equalTo(true));
        assertThat(roleWithRestriction.getRestriction().getWorkflows(), arrayContaining("search_application"));
        RoleDescriptor roleWithoutRestriction = roleDescriptorsByName.get("role_without_restriction");
        assertThat(roleWithoutRestriction.hasRestriction(), equalTo(false));
        assertThat(roleWithoutRestriction.getRestriction().isEmpty(), equalTo(true));
        assertThat(roleWithoutRestriction.getRestriction().hasWorkflows(), equalTo(false));
        assertThat(roleWithoutRestriction.getRestriction().getWorkflows(), nullValue());
    }
    public void testApiKeyServiceDisabled() throws Exception {
        final Settings settings = Settings.builder().put(XPackSettings.API_KEY_SERVICE_ENABLED_SETTING.getKey(), false).build();
        final ApiKeyService service = createApiKeyService(settings);
        ElasticsearchException e = expectThrows(
            ElasticsearchException.class,
            () -> service.getApiKeys(
                new String[] { randomAlphaOfLength(6) },