Add Resource.Status object and remove sync.Map

[tejal29]

Relates to #176

Add a resource.Status struct which stores the status of the deployment in Deployment.status field.

Remove sync.Map which was used to deployments status.

Output changes:

• No output changes.

Next PRs:

• Add updated and reported booleans to resource.Status.
• Update Status only if its changed instead of updating every single time.
• Finally merge in add polling status after every half second for deployment health check #2813

[codecov]

Codecov Report

Merging #2851 into master will increase coverage by 0.03%.
The diff coverage is 79.31%.

Impacted Files	Coverage Δ
pkg/skaffold/deploy/resource/deployment.go	100% <100%> (ø)	⬆️
pkg/skaffold/deploy/resource/status.go	60% <60%> (ø)
pkg/skaffold/deploy/status_check.go	64.04% <81.81%> (+1.82%)	⬆️