Add flags to history

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

internal/config/default_config.yaml

@@ -82,6 +82,7 @@ keybindings:
     delete_all: "X"
     sql_query: ":"
     filter: "/"
+    flag: "m"
 
   home:
     open: "enter,l"

internal/config/keybindings.go

@@ -39,6 +39,7 @@ type HistoryKeys struct {
 	DeleteAll   string `mapstructure:"delete_all"`
 	Filter      string `mapstructure:"filter"`
 	SqlQuery    string `mapstructure:"sql_query"`
+	Flag        string `mapstructure:"flag"`
 }
 
 type HomeKeys struct {