lds: extract filter chain manager from listener (#7152)

Preparation of FCDS. With FCDS the construction of listener and filter chains should be decoupled.
Another motivation is to split the huge listener_manager_impl.cc

This PR is the first step. The new physical design allows future changes at filter chain management without touching much of the listener.

Risk Level: Med
Testing: The test of filterchainmanager is left in listener manager test. Will split in future PRs.

Signed-off-by: Yuchen Dai <silentdai@gmail.com>

source/server/BUILD

@@ -253,18 +253,16 @@ envoy_cc_library(
     deps = [
         ":configuration_lib",
         ":drain_manager_lib",
+        ":filter_chain_manager_lib",
         ":lds_api_lib",
         ":transport_socket_config_lib",
         "//include/envoy/server:filter_config_interface",
         "//include/envoy/server:listener_manager_interface",
         "//include/envoy/server:transport_socket_config_interface",
         "//include/envoy/server:worker_interface",
         "//source/common/api:os_sys_calls_lib",
-        "//source/common/common:empty_string",
         "//source/common/config:utility_lib",
         "//source/common/init:manager_lib",
-        "//source/common/network:cidr_range_lib",
-        "//source/common/network:lc_trie_lib",
         "//source/common/network:listen_socket_lib",
         "//source/common/network:resolver_lib",
         "//source/common/network:socket_option_factory_lib",
@@ -280,6 +278,18 @@ envoy_cc_library(
     ],
 )
 
+envoy_cc_library(
+    name = "filter_chain_manager_lib",
+    srcs = ["filter_chain_manager_impl.cc"],
+    hdrs = ["filter_chain_manager_impl.h"],
+    deps = [
+        "//include/envoy/server:listener_manager_interface",
+        "//source/common/common:empty_string",
+        "//source/common/network:cidr_range_lib",
+        "//source/common/network:lc_trie_lib",
+    ],
+)
+
 envoy_cc_library(
     name = "process_context_lib",
     hdrs = ["process_context_impl.h"],