Log format compatibility

[pepov]

Add support for the automatic configuration of docker compatible log parsing with the CRI log format.

This has the following benefits:

• automatic json log parsing can happen using the Merge_Log Fluent Bit kubernetes filter
• downstream parsers can use the log field instead of message as they did with the docker runtime
• the concat and parser filters are automatically set back to use the log field instead of message

The example in the PR demonstrates a working configuration:

apiVersion: logging.banzaicloud.io/v1beta1
kind: Logging
metadata:
  name: containerd
spec:
  enableDockerParserCompatibilityForCRI: true

After this, fluentbit can be configured through either the Logging or the FluentbitAgent resource. (Fluentbit configured through the nodeAgents field of the Logging resource is not supported, since nodeAgents are deprecated)

Example log line produced:

{
  "log": "2024-08-12T14:19:29.672991171Z stderr F [2024/08/12 14:19:29] [ info] [input:tail:tail.0] inotify_fs_add(): inode=2939617 watch_fd=17 name=/var/log/containers/containerd-fluentd-0_default_fluentd-e46f1fcb1b63e7458fc43c079b7455f8e1305e551939ca128361a9574a194ed7.log",
  "kubernetes": {
    "pod_name": "containerd-fluentbit-mchwz",
    "namespace_name": "default",
    "pod_id": "22f86078-26f1-4202-bbc7-1dd5ddce20ec",
    "labels": {
      "app.kubernetes.io/instance": "containerd",
      "app.kubernetes.io/managed-by": "containerd",
      "app.kubernetes.io/name": "fluentbit",
      "controller-revision-hash": "6bb6f7f5f4",
      "pod-template-generation": "2"
    },
    "annotations": {
      "checksum/cri-log-parser.conf": "d902a0ee964e9398e637b581be851cdf50ab2846e82003d2f5e2feef82bef95d",
      "checksum/fluent-bit.conf": "dc9727d915c447b414dc05df2d9a6f23246cdca345309eb3107cc16ae8369b53"
    },
    "host": "logging",
    "container_name": "fluent-bit",
    "docker_id": "5cf032406344fdf41d76ce4489ee6f3ca092e9207ec49ab6209cc2bcf950e593",
    "container_image": "fluent/fluent-bit:3.0.4"
  }
}

[tarokkk]

LGTM