Add support for arbitrary pod-level securityContext settings

This allows for doing stuff like this on the custom resource:

```
security_context_settings:
  runAsUser: 1000
  runAsGroup: 0
```

I added `snakeCaseParameters: False` because without it, variables like `runAsUser` become `run_as_user`... and that doesnt work.

watches.yaml

@@ -4,14 +4,17 @@
   group: awx.ansible.com
   kind: AWX
   role: installer
+  snakeCaseParameters: False
 
 - version: v1beta1
   group: awx.ansible.com
   kind: AWXBackup
   role: backup
+  snakeCaseParameters: False
 
 - version: v1beta1
   group: awx.ansible.com
   kind: AWXRestore
   role: restore
+  snakeCaseParameters: False
 # +kubebuilder:scaffold:watch