Add protocol option in http2.connect
This option is used here: https://github.com/nodejs/node/blob/70c32a6d190e2b5d7b9ff9d5b6a459d14e8b7d59/lib/internal/http2/core.js#L3010
Checklist
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documentation is changed or added
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This option is used here: https://github.com/nodejs/node/blob/70c32a6d190e2b5d7b9ff9d5b6a459d14e8b7d59/lib/internal/http2/core.js#L3010