Support luaScripts - add ConfigMap template and DaemonSet volume mount for Lua scripts

## Feature Request
Add native support for Lua scripts in the chart.

## Use Case
Fluent Bit supports Lua filters via the `lua` filter plugin. Currently there is no way to
provide Lua scripts through the chart — users have to manually patch the ConfigMap after
every Helm deployment.

## Proposed Implementation
1. Add `luaScripts` to `values.yaml`:
```yaml
luaScripts: {}
# helpers.lua: |
# function my_filter(tag, timestamp, record)
# return 2, timestamp, record
# end
```

2. Add templates/configmap-luascripts.yaml:
```yaml
{{- if .Values.luaScripts -}}
apiVersion: v1
kind: ConfigMap
metadata:
name: {{ include "aws-for-fluent-bit.fullname" . }}-luascripts
namespace: {{ include "aws-for-fluent-bit.namespace" . }}
labels:
{{- include "aws-for-fluent-bit.labels" . | nindent 4 }}
data:
{{ range $key, $value := .Values.luaScripts }}
{{ $key }}: {{ (tpl $value $) | quote }}
{{ end }}
{{- end -}}
```

3. Add to daemonset.yaml volumeMount:
```yaml
{{- if .Values.luaScripts }}
- name: luascripts
mountPath: /fluent-bit/scripts/
{{- end }}
```

4. Add to daemonset.yaml volume:
```yaml
{{- if .Values.luaScripts }}
- name: luascripts
configMap:
name: {{ include "aws-for-fluent-bit.fullname" . }}-luascripts
{{- end }}
```

## References
fluent/fluent-bit chart implements this:
https://github.com/fluent/helm-charts/blob/main/charts/fluent-bit/templates/configmap-luascripts.yaml

Start with values.yaml and the existing templates/configmap and daemonset.yaml files, then compare the referenced Fluent Bit chart implementation. Render the chart with luaScripts configured and without it; done means the Lua ConfigMap and DaemonSet volume mount are present only when scripts are supplied.

Written by the indexing model from the issue text.