feat: Key-value pair view for environment

[cwangsmv]

Highlight and Changes:

Add new KV-pair view for environment, including collection environment, global environment and folder environment UI

• UI Change:
  • New key-pair table for collection environment, global environment and folder environment UI
  • Inline JSON Editor for JSON type value
  • Add button to switch JSON view & kv pair view
  • Confirm naming and default view for environment
• Models Change:
  • Add type and kv pair data attribute to environment and request-group data model
  • Ensure that newly add attributes won't add new attributes to old datas in git sync
• Data transform
  • JSON and kv pair data transform logic
• Tests
  • Fix test failure and add new e2e test for kv pair view