Migrate external consumers to namespaced MySQL include targets

Summary:
Migrate mysql_raft, squangle, and dbproxy to use fbcode-relative includes
with _namespaced targets instead of short includes with header_namespace.

Changes:
- mysql_raft: Update all source files and BUCK to use _namespaced deps
- squangle/mysql_client/mysql_protocol: Update to _namespaced deps
- dbproxy: Update frontend target to use _namespaced deps
- Expand visibility on _namespaced targets in mysql/server/include to
  include external consumers (dbproxy, squangle, mysql_raft)
- Fix duplicate container_utils_namespaced target in sql-common/BUCK
- Convert remaining short includes to fbcode-relative paths in mysql_raft
- Fix mysql_raft autodeps and convert remaining short includes
- Convert sql-common/oci to per-header targets
- Fix autodeps dependency issues for namespaced header targets:
  - Break cycle between mysql:namespaced_headers and components/services:namespaced_headers
  - Add per-file targets (service_plugin_registry, service_srv_session_bits) instead of aggregate deps
  - Remove sql:sql_log and sql_error_main deps from log_builtins to break cycle
- Fix autodeps2 issues in mysql_raft/BUCK and mysql_raft/log/BUCK:
  - Add missing _namespaced deps for header includes
  - Expand visibility on mysql_mutex_bits_namespaced and my_io_bits_namespaced
- Fix dependency cycle in sys_vars_shared_namespaced:
  - Remove unnecessary sql_table.h include from sys_vars_shared.h
  - This breaks the cycle: rpc_ddl_precheck_leader -> sys_vars_shared_namespaced -> sql_ddl_main -> rpc_ddl_precheck_leader

This is part of the autodeps migration to standardize MySQL header includes.

Reviewed By: nathan-liyiming

Differential Revision: D92447494

fbshipit-source-id: 7e2b4d1b121fe434aae9535a65a8333718f78ec7

Author: Nitin Garg

third-party/squangle/src/squangle/mysql_client/mysql_protocol/MysqlConnection.cpp

@@ -7,9 +7,9 @@
  */
 
 #include <folly/Exception.h>
-#include <mysql_async.h>
 #include <memory>
 #include <string>
+#include "mysql/server/include/mysql_async.h" // @manual=//mysql/server/include:mysql_async_namespaced
 
 #include "squangle/base/ExceptionUtil.h"
 #include "squangle/mysql_client/ConnectionOptions.h"

third-party/squangle/src/squangle/mysql_client/mysql_protocol/MysqlConnection.h

@@ -9,7 +9,7 @@
 #pragma once
 
 #include <fmt/format.h>
-#include <mysql.h>
+#include "mysql/server/include/mysql.h" // @manual=//mysql/server/include:mysql_namespaced
 
 #include "squangle/base/Base.h"
 #include "squangle/base/ConnectionKey.h"