Signed-off-by: Lee Yarwood <[email protected]>

Instance types and preferences provide a way to define common
VirtualMachine workload resource sizing and preferences.

The common-instancetypes project within KubeVirt currently provides a
set of standardized instance types and preferences that can be deployed
by `virt-operator` alongside all of the other core KubeVirt components.

While the resources provided by the common-instancetypes project are a
great starting point they are generalized and could never possibly cover
all workload resourcing and preference use cases.

As such this design proposal seeks to make it as easy as possible for
both cluster admins and users to create their own customized versions of
these commonly deployed resources specific to their workloads.
Additionally the instance type API itself will be made more flexible by
making vCPU and memory resource sizing optional within an instance type,
allowing users to provide their own sizing within their VirtualMachine
while still retaining the remaining benefits of using an instance type.

Signed-off-by: Lee Yarwood <[email protected]>

Apply suggestions from code review

Co-authored-by: Jed Lejosne <[email protected]>
Signed-off-by: Lee Yarwood <[email protected]>