feat: add AppConfiguration, Deploy, and Job models

[SparkYuan]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add AppConfiguration, Deploy, and Job models

Which issue(s) this PR fixes:

Fixes #370 #374

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., design docs, usage docs, etc.:

[coveralls]

Pull Request Test Coverage Report for Build 5807510372

• 119 of 354 (33.62%) changed or added relevant lines in 8 files are covered.
• 14 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-2.0%) to 70.557%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/generator/appconfiguration/generators/job_generator.go	59	74	79.73%
pkg/generator/appconfiguration/generators/app_configuration_generator.go	0	24	0.0%
pkg/cmd/spec/generator.go	0	27	0.0%
pkg/generator/appconfiguration/generators/namespace_generator.go	0	28	0.0%
pkg/generator/appconfiguration/generators/components_generator.go	0	31	0.0%
pkg/generator/appconfiguration/generators/util.go	59	106	55.66%
pkg/generator/appconfiguration/generators/deployment_generator.go	0	63	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/cmd/apply/options.go	7	71.92%
pkg/cmd/destroy/options.go	7	84.08%

Totals
Change from base Build 5780726001:	-2.0%
Covered Lines:	5217
Relevant Lines:	7394

---

💛 - Coveralls

[liu-hm19]

lgtm