Roll forward cl/466743774

Took a quick audit through all the QuicServer construction I could find in codesearch and fixed all the related memory lifetime issues I could find.  Issues fixed in cl/466791564, cl/466976602, cl/467223371, cl/467221646, and cl/467212926.

No changes from original CL (other than those made the separate fix CLs).

*** Original change description ***

Create QUICHE toy CONNECT proxy server

***

PiperOrigin-RevId: 467313603
diff --git a/build/source_list.bzl b/build/source_list.bzl
index 313dea4..90dd052 100644
--- a/build/source_list.bzl
+++ b/build/source_list.bzl
@@ -693,6 +693,7 @@
     "common/platform/api/quiche_file_utils.h",
     "common/platform/api/quiche_system_event_loop.h",
     "quic/platform/api/quic_default_proof_providers.h",
+    "quic/tools/connect_server_backend.h",
     "quic/tools/connect_tunnel.h",
     "quic/tools/fake_proof_verifier.h",
     "quic/tools/quic_backend_response.h",
@@ -717,6 +718,7 @@
 ]
 quiche_tool_support_srcs = [
     "common/platform/api/quiche_file_utils.cc",
+    "quic/tools/connect_server_backend.cc",
     "quic/tools/connect_tunnel.cc",
     "quic/tools/quic_backend_response.cc",
     "quic/tools/quic_client_base.cc",