Feature: Support creating multiple resources in device plugin charts

The helm charts for the plugins are great for setting NFD rules, but they're pretty limited when it comes to configuring device plugin resources.

There are cases where a user may want to configure multiple device plugin resources. For example when nodes have different GPUs, and you want to configure `sharedDevNum` to balance workloads more evenly.

I would propose adding support for creating additional device plugin resources in the chart. Additionally, if the user would prefer to configure their device plugin resources manually, having the option to disable the "sample" plugin in the chart and only install the NFD rules would be useful.

I'm happy to test some options and open a PR