[aws-for-fluent-bit] add support for running pods in hostNetwork

When running a cluster with custom CNI configuration with additional CIDR blocks then it would be handy to run fluent-bit pods in host network to avoid NAT for the logging traffic.

Helm Chart: **aws-for-fluent-bit**

Adding `hostNetwork` to the daemonset and make it default `false`.

Start by locating the aws-for-fluent-bit Helm chart's DaemonSet template and its values configuration. Add a configurable hostNetwork setting with a default of false, then verify the rendered chart produces the expected DaemonSet configuration when enabled and leaves it disabled by default.

Written by the indexing model from the issue text.