The `resources` field should be required

[technosophos]

According to the current version of the spec:

• the container.resources field is required
• the container.resources.cpu field is required
• the container.resources.memory field is required

I think this is bad, but... it is what the spec says, so we should fix that in Rudr.

[technosophos]

See:

• https://github.com/oam-dev/spec/blob/master/3.component_model.md#container
• remove requirement for CPU and memory spec#218
• Resources is optional, but if specified, requires CPU and memory spec#182