Add support for HTTP/1 connection pre-warming #165

Job	Run time
Release builds / Construct release build matrix	6s
Cxx interop / Construct Cxx interop matrix	5s
Unit tests / Construct unit test matrix	6s
Soundness / Documentation check	3m 10s
Static SDK / Static SDK / Linux (main Jammy)	4m 22s
Soundness / YAML lint check	6s
Static SDK / Static SDK / Linux (latest-release Jammy)	3m 46s
Soundness / Format check	42s
Soundness / License headers check	5s
Soundness / API breakage check	4m 34s
Soundness / Python lint check	11s
Soundness / Broken symlinks check	6s
Soundness / Shell check	37s
Soundness / Unacceptable language check	6s
Release builds / Release builds / Linux (5.10)	3m 42s
Release builds / Release builds / Linux (nightly-next)	5m 8s
Release builds / Release builds / Linux (6.1)	3m 46s
Release builds / Release builds / Linux (6.0)	4m 8s
Release builds / Release builds / Linux (nightly-main)	4m 53s
Cxx interop / Cxx interop / Linux (6.0)	2m 53s
Cxx interop / Cxx interop / Linux (6.1)	3m 6s
Cxx interop / Cxx interop / Linux (5.10)	2m 42s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 39s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 50s
Unit tests / Unit tests / Linux (6.0)	5m 33s
Unit tests / Unit tests / Linux (6.1)	5m 22s
Unit tests / Unit tests / Linux (nightly-next)	6m 7s
Unit tests / Unit tests / Linux (nightly-main)	5m 58s
Unit tests / Unit tests / Linux (5.10)	4m 57s
	1h 23m 46s

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