feat(assistant): Assistant and AssistantFiles api (#1803)

* Initial implementation of assistants api

* Move load/save configs to utils

* Save assistant and assistantfiles config to disk.

* Add tsets for assistant api

* Fix models path spelling mistake.

* Remove personal go.mod information

---------

Co-authored-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

pkg/utils/config.go

@@ -0,0 +1,41 @@
+package utils
+
+import (
+	"encoding/json"
+	"github.com/rs/zerolog/log"
+	"os"
+	"path/filepath"
+)
+
+func SaveConfig(filePath, fileName string, obj any) {
+	file, err := json.MarshalIndent(obj, "", " ")
+	if err != nil {
+		log.Error().Msgf("Failed to JSON marshal the uploadedFiles: %s", err)
+	}
+
+	absolutePath := filepath.Join(filePath, fileName)
+	err = os.WriteFile(absolutePath, file, 0644)
+	if err != nil {
+		log.Error().Msgf("Failed to save configuration file to %s: %s", absolutePath, err)
+	}
+}
+
+func LoadConfig(filePath, fileName string, obj interface{}) {
+	uploadFilePath := filepath.Join(filePath, fileName)
+
+	_, err := os.Stat(uploadFilePath)
+	if os.IsNotExist(err) {
+		log.Debug().Msgf("No configuration file found at %s", uploadFilePath)
+		return
+	}
+
+	file, err := os.ReadFile(uploadFilePath)
+	if err != nil {
+		log.Error().Msgf("Failed to read file: %s", err)
+	} else {
+		err = json.Unmarshal(file, &obj)
+		if err != nil {
+			log.Error().Msgf("Failed to JSON unmarshal the file %s: %v", uploadFilePath, err)
+		}
+	}
+}