feat(cli): ✨ Implement Edge Connect CLI tool

Creates a new command-line interface for managing Edge Connect applications and instances with the following features:

- Configuration management via YAML files and environment variables
- Application lifecycle commands (create, show, list, delete)
- Instance management with cloudlet support
- Improved error handling and authentication flow
- Comprehensive documentation with usage examples

The CLI provides a user-friendly interface for managing Edge Connect resources while following best practices for command-line tool development using Cobra and Viper.

client/client.go

@@ -5,9 +5,10 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-
+	"io"
 	"log"
 	"net/http"
+	"strings"
 )
 
 var ErrResourceNotFound = fmt.Errorf("resource not found")
@@ -32,7 +33,8 @@ func (e *EdgeConnect) RetrieveToken(ctx context.Context) (string, error) {
 		return "", err
 	}
 
-	request, err := http.NewRequestWithContext(ctx, "POST", e.BaseURL+"/api/v1/login", bytes.NewBuffer(json_data))
+	baseURL := strings.TrimRight(e.BaseURL, "/")
+	request, err := http.NewRequestWithContext(ctx, "POST", baseURL+"/api/v1/login", bytes.NewBuffer(json_data))
 	if err != nil {
 		return "", err
 	}
@@ -45,12 +47,22 @@ func (e *EdgeConnect) RetrieveToken(ctx context.Context) (string, error) {
 
 	defer resp.Body.Close()
 
+	// Read the entire response body
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("error reading response body: %v", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("login failed with status %d: %s", resp.StatusCode, string(body))
+	}
+
 	var respData struct {
 		Token string `json:"token"`
 	}
-	err = json.NewDecoder(resp.Body).Decode(&respData)
+	err = json.Unmarshal(body, &respData)
 	if err != nil {
-		return "", err
+		return "", fmt.Errorf("error parsing JSON (status %d): %v", resp.StatusCode, err)
 	}
 
 	return respData.Token, nil