Multiple filesets using hints autodiscovery

[tetianakravchenko]

In this PR was changed the default behavior and now all filesets will be disabled unless explicitly configured.

Cuurrent state:
From documentation it seems that it is possible to set only 1 fileset
https://www.elastic.co/guide/en/beats/filebeat/current/configuration-autodiscover-hints.html#_co_elastic_logsfileset:

You can either configure a single fileset like this:

co.elastic.logs/fileset: access

Desired state:
be able to provide multiple values of fileset configuration, example:

annotations:
        co.elastic.logs/enabled: "true"
        co.elastic.logs/module: elasticsearch
        co.elastic.logs/fileset: server,slowlog,audit

[tetianakravchenko]

Outcome of the discussion:

1. Other option for this issue:
   change default behavior in case of using hints-based auto discovery and enable all filesets of the module

2. Try workaround and set multiple modules
   https://www.elastic.co/guide/en/beats/filebeat/current/configuration-autodiscover-hints.html#_multiple_sets_of_hints
   smth like: (not tested!)

annotations:
  co.elastic.logs/1.module: elasticsearch
  co.elastic.logs/1.fileset: server
  co.elastic.logs/2.module: elasticsearch
  co.elastic.logs/2.fileset: slowlog
...

[tetianakravchenko]

I've checked that on version 8.2.0 all works as expected.
With annotation:

annotations:
        co.elastic.logs/enabled: "true"
        co.elastic.logs/module: elasticsearch

all filesets by the default are available:
in CreateConfig is called getFilesets, that return configuration for module with all available filesets enabled