Add SOCKS5 proxy support to bot

In Soviet Russia... wait, wrong time period.

lib/config/config.go

@@ -30,6 +30,14 @@ type TelegramConnection struct {
 	ListenAddress string `yaml:"listen_address"`
 }
 
+// ProxySettings handles settings for SOCKS5 proxy in config.yml
+type ProxySettings struct {
+	Enabled  bool   `yaml:"enabled"`
+	Address  string `yaml:"address,omitempty"`
+	Username string `yaml:"username,omitempty"`
+	Password string `yaml:"password,omitempty"`
+}
+
 // SpecialChats handles settings for special chats
 type SpecialChats struct {
 	AcademyID      string `yaml:"academy_id"`
@@ -48,6 +56,7 @@ type LoggingConfig struct {
 type Config struct {
 	Telegram     TelegramConnection `yaml:"telegram_connection"`
 	Database     DatabaseConnection `yaml:"database_connection"`
+	Proxy        ProxySettings      `yaml:"socks_proxy"`
 	SpecialChats SpecialChats       `yaml:"special_chats"`
 	Logs         LoggingConfig      `yaml:"logs"`
 }