Validation errors should give useful debugging information

[thomastaylor312]

When I was debugging the issue in #194, I was receiving the following validation error:

Validation error in object: {"name":"nats","properties":{"contract":"wasmcloud:messaging","image":"wasmcloud.azurecr.io/nats_messaging:0.17.3"},"traits":[{"properties":{"spread":[{"name":"onkube","requirements":{"cosmo_connect":"k8s","kubernetes":"true"}}]},"type":"daemonscaler"}],"type":"capability"}
Object path: /spec/components/1Validation error in object: {"name":"applier","properties":{"contract":"cosmonic:kubernetes_applier","image":"wasmcloud.azurecr.io/applier:0.3.0"},"traits":[{"properties":{"spread":[{"name":"onkube","requirements":{"cosmo_connect":"k8s","kubernetes":"true"}}]},"type":"daemonscaler"}],"type":"capability"}
Object path: /spec/components/2Validation error in object: {"name":"httpserver","properties":{"contract":"wasmcloud:httpserver","image":"wasmcloud.azurecr.io/httpserver:0.19.1"},"traits":[{"properties":{"spread":[{"name":"onkube","requirements":{"cosmo_connect":"k8s","kubernetes":"true"}}]},"type":"daemonscaler"}],"type":"capability"}
Object path: /spec/components/3

While this is better than nothing, what it doesn't do is provide any indication as to what is missing or wrong with the data. We should update our errors to be more clear about what is missing. An error above should have said something like

Validation error with component "nats": Missing field `replicas`

[stale]

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