[filebeat][httpjson] Initial implementation of httpjson v2 (#22320) (#…

…22920)

* Add oauth config

* Add stateless input

* Add request and basic config

* Create v2 input and basic transforms

* Refactor and set up basic requester structure

* Run fmt

* Set tests and fix tpl

* basic processing structure

* Add pagination mechanism

* Publish the events

* Add check redirect and oauth tests

* Deprecate old httpjson and include both

* Return default value if execution is empty

* wip

* Add split

* Handle request errors and pagination end

* Add date functions for templates and tests

* Add getRFC5988Link functionality to templates

* Switch between v1/v2 based on config flag

* Add cursor

* Add rate limit

* Put back original filebeat.yml

* Add deprecation warning for old httpjson version

* Add transform tests

* Initial doc changes

* Add more debug logs and split tests

* Ignore empty values on set and append

* Allow content type and accept override and change redirect default

* Add add and toInt functions

* Support array responses

* Add tests cases and minor changes

* Add changelog entry

* Do not copy mutex on delete transform

* Add PR suggestions:
  - Modify context done error log
  - Change is_v2 config bool for string config_version
  - Change retryable logger to be created from input logger

* Documentation fixes

(cherry picked from commit 47d8941)

CHANGELOG.next.asciidoc

@@ -478,6 +478,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Improve Nats filebeat dashboard. {pull}22726[22726]
 - Add support for UNIX datagram sockets in `unix` input. {issues}18632[18632] {pull}22699[22699]
 - Add `http.request.mime_type` for Elasticsearch audit log fileset. {pull}22975[22975]
+- Add new httpjson input features and mark old config ones for deprecation {pull}22320[22320]
 
 *Heartbeat*