support for network baseline/burst flags

[ashwallace]

Like EBS, EC2 instance network capacity also has baseline and burst bandwidth. Current --network-performance-min and max flags do not consider this, it would be nice if it did to bring it in line with how this tool can filter with the ebs baseline flags.

for example, a flag of --network-performance-min 5 GiB shows me in m5.xlarge (but it only has 1.25gbps of baseline bandwidth)
--network-performance-min 5 GiB --vcpus 4 --current-generation --output table --max-results 100 --region ap-southeast-2

Location of baseline bandwidth is in the EC2 documentation, example: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/general-purpose-instances.html#general-purpose-network-performance