Implemented LoadModules method to load external modules at runtime.

Implemented UnloadModules method to remove modules at runtime.
Implemented ListModules method to list the current loaded modules.
Implemented "MODULE LOAD", "MODULE UNLOAD", and "MODULE LIST" commands.

internal/types.go

@@ -78,6 +78,9 @@ type HandlerFuncParams struct {
 	TakeSnapshot          func() error
 	RewriteAOF            func() error
 	GetLatestSnapshotTime func() int64
+	LoadModule            func(path string, args ...string) error
+	UnloadModule          func(module string)
+	ListModules           func() []string
 }
 
 type HandlerFunc func(params HandlerFuncParams) ([]byte, error)