Add connector plugin

[pingsutw]

Tracking issue

NA

Why are the changes needed?

Add a connector plugin

What changes were proposed in this pull request?

• Add mock files for the connector
• Move v1 flyteplugins/go/tasks/pluginmachinery/internal/webapi/* to v2 branch
• Move v1 flyteplugins/go/tasks/pluginmachinery/webapi/* to v2 branch
• Add webapi/connector plugin

How was this patch tested?

Labels

Please add one or more of the following labels to categorize your PR:

• added: For new features.
• changed: For changes in existing functionality.
• deprecated: For soon-to-be-removed features.
• removed: For features being removed.
• fixed: For any bug fixed.
• security: In case of vulnerabilities

This is important to improve the readability of release notes.

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link