Introduce GoPool interface and update NewGoPool function

- Introduced a new GoPool interface that includes all public methods of the goPool struct.
- Updated the NewGoPool function to return the GoPool interface instead of the goPool struct.
- This change makes the GoPool interface visible outside the package and allows for future extensions with different GoPool implementations.

Signed-off-by: Daniel Hu <tao.hu@merico.dev>

Author: daniel-hutao

gopool.go

@@ -6,6 +6,13 @@ import (
 	"time"
 )
 
+// GoPool represents a pool of workers.
+type GoPool interface {
+	AddTask(t task)
+	Wait()
+	Release()
+}
+
 // task represents a function that will be executed by a worker.
 // It returns a result and an error.
 type task func() (interface{}, error)
@@ -37,7 +44,7 @@ type goPool struct {
 }
 
 // NewGoPool creates a new pool of workers.
-func NewGoPool(maxWorkers int, opts ...Option) *goPool {
+func NewGoPool(maxWorkers int, opts ...Option) GoPool {
 	ctx, cancel := context.WithCancel(context.Background())
 	pool := &goPool{
 		maxWorkers: maxWorkers,

worker.go

@@ -69,7 +69,7 @@ func (w *worker) executeTaskWithTimeout(t task, pool *goPool) (result interface{
 		return result, err
 	case <-ctx.Done():
 		// The context timed out, the task took too long
-		return nil, fmt.Errorf("Task timed out")
+		return nil, fmt.Errorf("task timed out")
 	}
 }