aws-for-fluent-bit - allow podSecurityContext and securityContext as input

**Is your feature request related to a problem?**
There is no option to set security on the pod

**Is your feature request related to a specific Helm chart, if yes mention name of the chart?**
aws-for-fluent-bit

**Describe the solution you'd like**
parametrize templates and take input from values.yaml

**Describe alternatives you've considered**
None

Start by locating the aws-for-fluent-bit chart, its templates, and values.yaml. Trace how the pod manifest is rendered, then verify that inputs for podSecurityContext and securityContext are accepted from values.yaml and appear in the rendered output.

Written by the indexing model from the issue text.