Add changelog command (ChatOps)

[rinx]

Description:

• Updated CHANGELOG since v0.0.30.
• Added ChatOps feature /changelog.
• Updated semver workflow.

Related Issue:

Nothing.

How Has This Been Tested?:

Not yet. the first release after this PR merged may fail..

Environment:

• Go Version: 1.14.3
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.11.5

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

[pull-assistant]

Best reviewed: commit by commit

---

Optimal code review plan

     💄 Reformat CHANGELOG.md

     📝 Add missing CHANGELOGs

     ✨ Add Changelog template

     ✨ Add auto-update feature of CHANGELOG

     🚀 Add changelog permissions

     🤖 Update license headers / Format go codes and yaml files

     ✨ add links

     📝 Add links to prs

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[rinx]

/rebase
/format

[vdaas-ci]

[REBASE] Rebase triggered by rinx for branch: ci/chatops/add-changelog-command

[vdaas-ci]

[FORMAT] Updating license headers and formatting go codes triggered by rinx.

[kpango]

LGTM