Add Deployment resource struct.

[tejal29]

Add Deployment resource struct and use that instead of using map[string]Deadline for tracking resources.
Pass the same object to print summary.
The summary will now print the namespace of the object

Output change:
Before: skaffold run --default-repo gcr.io/tejal-test --status-check --namespac=test

skaffold run --default-repo gcr.io/tejal-test --status-check --namespac=test
Generating tags...
...
Deploy complete in 3.513243437s
Waiting for deployments to stabilize
 - deployment/leeroy-web is ready. [1/2 deployment(s) still pending]
 - deployment/leeroy-app is ready.
Deployments stabilized in 1.150739535s

After:

tejaldesai@@microservices (small_resource)$ skaffold run --default-repo gcr.io/tejal-test --status-check --namespace=test
Generating tags...
...
Deploy complete in 3.513243437s
Waiting for deployments to stabilize
 - test:deployment/leeroy-app is ready. [1/2 deployment(s) still pending]
 - test:deployment/leeroy-web is ready.
Deployments stabilized in 1.150739535s

[tejal29]

This will print test:deployment/leeroy-app where test is namespace and leeroy-app is deployment name

[codecov]

Codecov Report

Merging #2847 into master will increase coverage by 0.04%.
The diff coverage is 75%.

Impacted Files	Coverage Δ
pkg/skaffold/deploy/resource/deployment.go	100% <100%> (ø)
pkg/skaffold/deploy/status_check.go	62.22% <60%> (+0.42%)	⬆️

[balopat]

LGTM

[balopat]

• integration test TestRunUnstableChecked is failing as now the name of the deployment has namespace + deployment and we are checking that string - maybe we should relax that check to be less fragile

• you have some lints