Decide on the resource requests/limits for Neuron device plugin and scheduler

[RobertLucian]

Description

Change to appropriate resource requests and/or limits for Neuron k8s device plugin. The AWS team has said their device plugin uses few CPU/Mem resources, but that's still not a number. To be done in manager/manifests/inferentia.yaml.

Currently, we've associated 100m CPU time & 100Mi memory for the device plugin. Change that to an appropriate value once more information is released by them.

Additional context

As discussed in aws-neuron/aws-neuron-sdk#103.