Add protocol versions to `{Worker,Serve}Proto::*Conn` (cherry picked from commit 4d17c59d8d059a5b39f1d1da2b58f2ec8da44861) Change-Id: I497af39deb792e50c157a1305d8c9e722798740b
I497af39deb792e50c157a1305d8c9e722798740b
Introduce separate Serve protocol serialisers (cherry picked from commit d070d8b7460f412a657745698dba291c66792402) Change-Id: Ibcc8639e8997bcd07f7a5318330a147bcadc411b
Ibcc8639e8997bcd07f7a5318330a147bcadc411b