feat: add artifact common parameter type.

[Jeremy-boo]

add common type ArtifactParameterSpec & NamedValue into pkg

Changes

add artifact.go

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• spec PR link included
• Follows the commit message standard
• Meets the contributing guidelines (including
  functionality, content, code)
• Test cases with documentation and functionality works as expected using current and related github repos (MUST deploy and check)
• Release notes block below has been filled in or deleted (only if no user facing changes)

Release Notes

[alaudabot]

Quality Gate

_{updated at Wed Aug 24 03:43:20 UTC 2022}

Status: OK 🟢

Metric	Rating
🐛 Bugs: 0	🏗 Reliability: A 🟢
🤮 Code smells: 0	🛠 Maintainability: A 🟢
⚠️ Vulnerabilities: 0	🦺 Security: A 🟢
🔥 Security hotspots: 0	🔎 Security Review: A 🟢

Metric	Change set	Target (main)	After
🧪 Code coverage	0.00% Coverage on 1 new lines	44.40%	44.40% ↔️ 🟢 estimated after merge allowed difference 0
👥 Duplications	0.00% Duplications on 0 new lines	0.20%	0.20% ↔️ 🟢 estimated after merge allowed difference 0

[254]