feat: force HotReload after grace period instead of blocking indefinitely

[pepov]

Forward port of #1885

HotReload pauses all inputs and waits until they finish.
In certain situations this is unacceptable, for example if an output is down for a longer time.
An undocumented option called "Hot_Reload.Ensure_Thread_Safety Off" can be used at the [SERVICE] config to force hotreload after the grace period.
Please note that it might result in a SIGSEGV, but worst case kubelet will restart the container.
See fluent/fluent-bit#7509

Example config:

apiVersion: logging.banzaicloud.io/v1beta1
kind: FluentbitAgent
spec:
  forceHotReloadAfterGrace: true