Allow explicit configuration of TTRPC address

Previously the TTRPC address was generated as "<GRPC address>.ttrpc".
This change now allows explicit configuration of the TTRPC address, with
the default still being the old format if no value is specified.

As part of this change, a new configuration section is added for TTRPC
listener options.

Signed-off-by: Kevin Parsons <kevpar@microsoft.com>

services/server/config/config.go

@@ -37,6 +37,8 @@ type Config struct {
 	PluginDir string `toml:"plugin_dir"`
 	// GRPC configuration settings
 	GRPC GRPCConfig `toml:"grpc"`
+	// TTRPC configuration settings
+	TTRPC TTRPCConfig `toml:"ttrpc"`
 	// Debug and profiling settings
 	Debug Debug `toml:"debug"`
 	// Metrics and monitoring settings
@@ -125,6 +127,13 @@ type GRPCConfig struct {
 	MaxSendMsgSize int    `toml:"max_send_message_size"`
 }
 
+// TTRPCConfig provides TTRPC configuration for the socket
+type TTRPCConfig struct {
+	Address string `toml:"address"`
+	UID     int    `toml:"uid"`
+	GID     int    `toml:"gid"`
+}
+
 // Debug provides debug configuration
 type Debug struct {
 	Address string `toml:"address"`