Add Connector proto

[pingsutw]

Tracking issue

NA

What changes were proposed in this pull request?

Add Connector proto

How was this patch tested?

make gen

[flyte-bot]

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[bito-code-review]

Bito Automatic Review Skipped - Branch Excluded

Bito didn't auto-review because the source or target branch is excluded from automatic reviews.
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[pingsutw]

Going to add the connector service