Update fleet output resource to new API schema format (#434)

- Updated fleet output to use new schema format, where each output
kind now has a strongly typed data structure to hold the relevant
configuration items.
- Relocated the fleet api generators to match repo style, and
cleaned up the schema downloader and filtering functions.
- Expose 'ca_trusted_fingerprint' config value
- Add test case for logstash output

Author: taylor-swanson

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## [Unreleased]
 
+- Update `elasticstack_fleet_output` to use new API schema format ([#434](https://github.com/elastic/terraform-provider-elasticstack/pull/434))
+
 ## [0.8.0] - 2023-09-26
 
 ### Added

docs/resources/fleet_output.md

@@ -42,6 +42,7 @@ resource "elasticstack_fleet_output" "test_output" {
 ### Optional
 
 - `ca_sha256` (String) Fingerprint of the Elasticsearch CA certificate.
+- `ca_trusted_fingerprint` (String) Fingerprint of trusted CA.
 - `config_yaml` (String, Sensitive) Advanced YAML configuration. YAML settings here will be added to the output section of each agent policy.
 - `default_integrations` (Boolean) Make this output the default for agent integrations.
 - `default_monitoring` (Boolean) Make this output the default for agent monitoring.